How I turn 1 idea into 21 ready-to-publish Substack Notes in under 5 minutes (with this Claude prompt)
One custom AI tool. One prompt. 21 angles. The 21-Angle Prompt you can copy below.
One of the things I hear constantly from Substack writers:
I know I should be writing more Notes. But I never know what to say.
I get it.
The advice out there is basically: show up consistently, post every day, be authentic. Even Substack has it in the posts.
It makes you think, ok, but about what, exactly?
The blank-page situation
I remember when I first started on Substack. My core focus was Notes because of the organic discoverability. But guess what, I was staring at the screen like someone who’d never written a sentence in their whole life.
Which is hilarious, because I’d been writing professionally for 15 years at that point. Marketing copy. Emails. Presentations. None of it prepared me for the panic of a blank Substack Notes screen.
I’d open it. Type something. Delete it. Walk away.
I posted 4 Notes in my first month. Four. And every guru kept telling me Notes was the easiest way to grow. Easiest for who?
That’s when I started studying Notes that actually worked - collected and analyzed viral Notes. Posted like crazy, and analyzed data from thousands of my Notes with AI.
The same shapes kept showing up. Tips. Mistakes. Myths. Stats. Stories.
Few months later I launched the Viral Notes Writer GPT and it was a blast. Squeezed my time staring at the screen from hours a day to just 15 minutes in writing and posting.
The thing is, you have plenty of ideas. What you don’t have is a way to squeeze 21 Notes out of every one of them.
That’s what I want to show you today.
I call it the 21-Angle Prompt.
Grow the right type of subscribers
Before I give you the prompt, I want to make one thing clear.
Don’t just paste any idea into this prompt.
I convert subscribers coming from Notes at the highest rates (11.7% in the best months), because I don’t write about random ideas or what I ate today. I write Notes that connect to my paid tier, not just my newsletter topics. The paid tier.
That’s how I attract the right type of people - ready to convert.
If you run a free newsletter, write Notes that solve the problems you solve with your products or services.
And if you don’t have monetization enabled yet, take the QUEST.
The 21-Angle Prompt
Use this prompt with Claude Opus and my brand new Claude skill - it has the Viral Notes Writer instructions and templates collected from thousands of viral Notes and Notes that deliver subscribers (not always viral), over the past 2 years.
STEP 1: If you haven’t already, get the Viral Notes Writer Claude skill here:
STEP 2: Then use the 21-Angle prompt.
Here it is, exactly as I use it with my custom Notes Writer:
Come up with 21 different angles and turn them into Notes about my
[solution] that solves a painful [problem] for my [audience].
Use exactly these 21 angle types and format each one as a
scroll-stopping headline:
Tips · Stats · Steps · Lessons · Benefits · Reasons · Mistakes ·
Examples · Questions · Ways · Ideas · Myths · Tools · Frameworks ·
Comparisons · Objections · Predictions · Challenges · Results ·
Trends · Prompts · Signs
For each angle, output: a Note as per your training.You fill in your [solution], [problem], and [audience].
That’s it.
The Viral Notes Writer does the rest.
Here’s how I used it today, and the Notes were simply amazing:
What you get
Say you’re a career coach. Your solution is interview prep. Your problem is candidates freezing up under pressure. Your audience is mid-career professionals switching industries.
Run the prompt. Within 90 seconds, you get 21 different Notes. Each one fully formed. Each one attacking the same idea from a completely different direction.
The “Stats” Note opens with: “72% of candidates lose the job in the first 3 minutes of an interview. Here’s what’s actually happening.”
The “Myths” Note opens with: “The biggest lie about interview prep: practice makes perfect. It doesn’t. Here’s what does.”
The “Signs” Note opens with: “5 signs your interview prep is already working, even if you don’t feel ready yet.”
Same idea. 21 entry points.
You don’t publish all 21 at once. You pick the strongest 5 or 6 for the week. Stagger the rest across the month. One idea just became three weeks of content.
TLDR version
Running out of things to say on Substack Notes is a system problem, not a creativity problem.
This 21-Angle Prompt turns one idea into 21 angles in under 5 minutes. The Viral Notes Writer turns those 21 angles into 21 publishable Notes in your voice.
Copy the prompt above. Plug in your [solution], [problem], [audience]. Run it once.
Make sure your idea is connected to the problems you solve in your paid tier, product or service, not how you spent the day.
Come back and tell me which angle surprised you most.
FAQ: The 21-Angle Prompt
Can I use the 21-Angle Prompt without a the Viral Notes Writer skill? Yes. Run it in ChatGPT, Claude, or Gemini. Add 3 samples of your best performing Notes upfront so the model picks up your voice. The output needs slightly more editing than a trained GPT, but the 21 angles still arrive. The Viral Notes Writer has extensive training from data collected and curated for years, and it proved it’s results with more than 200+ people using it, so I’d stay on the safe side with it.
Do I have to use Claude Opus? The Viral Notes Writer skill works best with Claude Opus. You can run it on Sonnet and it still works, but Opus catches more nuance in the headline angles, especially the Myths, Comparisons, and Objections frames where voice really matters. If you’re already paying for Claude, switch to Opus for this prompt. If you’re on the free tier, Sonnet still beats staring at a blank screen.
How long does it take to generate 21 Notes? Under 5 minutes with my custom GPT or the Claude skill. Closer to 10 minutes with a standard model, because you’ll have to spend time on the voice and formatting context.
Do I have to use all 21 angles? No. Pick the 5 or 6 strongest for the week. Save the rest. One idea becomes about three weeks of content.
Which angle types convert best on Substack Notes? In my own data, Myths, Mistakes, Stats, and Comparisons drive the most restacks. Signs and Predictions drive the most subscribes. Tips drive the most likes but the fewest subscribers. This might be specific to my audience, so test with your own.
What’s the difference between the 21-Angle Prompt and just asking ChatGPT or Claude for Note ideas? Try it. You’ll get completely different results. Open-ended brainstorming gives you 5 to 7 angles before the model loops. The 21-Angle Prompt forces it through 21 distinct frames in a single pass, so you never get two Notes that say the same thing twice.
Do I have to have a paid product to use this? Ideally, yes. The prompt works best when your [solution] is something you actually sell, because that’s how Notes turn into subscribers who turn into buyers. If you don’t have a product yet, use the prompt to write Notes around the problems you plan to solve in the future. Pick a problem you’ll monetize within the next 90 days. That way you’re building an audience that already wants what you’re going to launch.
Can I use this prompt for LinkedIn posts, tweets, or Threads? Yes. Swap “Notes” for the platform in the prompt and adjust the headline format. The 21 angle types are platform-agnostic.
Yana
P.S. If you want to build a custom Claude skill or GPT for writing Notes, so that you don’t have to give it context every time, I can help - check out this link.
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This is incredible Yana, going to share this in my newsletter :)
Reading this, I keep thinking about how most advice tells you to “post more Notes” like volume alone solves anything.
You quietly replaced that with a machine that turns one high-leverage idea into weeks of content that pulls the right readers, the ones who convert at 11%+.
The real unlock isn’t the 21 angles. It’s that every angle is pre-aligned with something that makes money.
You stopped burning time on random authenticity and started building a content layer that funds the next iteration.
That shift feels honest and quietly ruthless in the best way.