6 PROMPTS THAT MAKE GROWING ON SUBSTACK FEEL ILLEGAL. (SAVE THIS)
My Claude S.I.G.N.A.L. Method replaces most Substack “GURU” advice.
Hey writers:
Most creators treat low performance as one problem → “my content isn’t good enough.” That’s almost never true.
Every problem has a cause and an exact fix.
Example:
→ The open rate problem and the restack problem are completely different failures. (Applying the same fix to both is why nothing changes.)
I engineered one Claude prompt per problem. You paste it, you get the diagnosis, you get the rewrite.
Note 📝: This system played a big role in making my notes go viral.
The Real Problem:
Your Substack isn’t growing because you’re applying generic advice to specific failures.
→ Low open rates need better subject lines. Not better content. ✅
→ No restacks need more shareable angles. Not more value. ✅
→ No paid upgrades need a conversion moment. Not more free posts. ✅
What keeps most creators stuck?
1/ Wrong diagnosis; → You get low engagement. You write better content. Nothing changes. ❌👎
2/ Generic fixes; → You follow growth advice that worked for someone else’s broken metric. Not yours. ❌👎
3/ No specific prompt; → You ask Claude to “help your Substack.” You get general advice. You needed surgery. ❌👎
The S.I.G.N.A.L. Method fixes the right thing — not everything at once.
The S.I.G.N.A.L. Method:
❶ S — Subscribers (No Subscribers → start here first)
❷ I — Inboxes (Low Open Rates → fix the subject line)
❸ G — Growth Loops (No Restacks → fix shareability)
❹ N — Network (No Comments → fix the engagement trigger)
❺ A — Ascension (Zero Paid Subscribers → fix the conversion moment)
❻ L — Links (Low Clicks → fix the CTA)
❶ S — SUBSCRIBERS 📈 (No Subscribers → start here first)
The prompt that converts followers to subscribers.
I run this before I change anything else. Before I redesign the bio or about page. Before I rewrite a post.
Most creators rewrite their content when nobody subscribes. The content isn’t the problem. The profile is.
Nobody subscribes to a creator they don’t immediately understand.
You have 4 seconds on your about page.
This prompt audits those 4 seconds.✅ ✅
Mini-Prompt: The Subscribe X-Ray
"You are a Substack growth strategist specializing in converting casual readers into subscribers.
I'm not gaining new subscribers even though people are visiting.
My niche is '[YOUR NICHE]' and my target reader is '[YOUR AUDIENCE].'
Review my Substack description, about page, and the last 3 post headlines and substack notes that I'll paste below.
Give me 3–5 specific fixes to my bio, welcome section, or first-impression content.
Each fix must increase clarity, credibility, or subscribe-worthiness.
Rule: Every fix must be specific enough to implement in under 10 minutes.
Tell me exactly what to change and what to replace it with.
VARIABLES:
1/ My current bio: [PASTE BIO]
2/ My current About Page: [PASTE PAGE]
3/ My last 3 headlines: [PASTE HEADLINES]
4/ My last 3 Notes: [PASTE NOTES]"Pro Secrets:
Paste your actual about page. Not a cleaned-up version of it. The prompt finds the specific word that’s costing you subscribers (but only if you give it the raw, live version.)
#Why It’s a Game-Changer 🔥
• Before: You rewrite another post. You think better content will fix it. The subscriber count doesn’t move.
• After: You find out your bio says “I write about AI and productivity and creativity” — and that one line is why nobody stays. You rewrite it. The next week gets 40 new subscribers from the same traffic.
#Common Mistakes to Avoid:
Don’t say “write me my bio”. Claude needs to see the problem. Give it what’s live. That’s the one that’s hurting you.
❷ I — INBOXES 📬 (fixes Low Open Rates & subject lines)
I use this the moment my open rate drops below my 1-week average.
Open rate is purely a subject line problem. Not a content problem. Not a post quality problem.
Your email got opened or it didn’t before anyone read a single word. Everything else is downstream.
Mini-Prompt: The Open Rate Autopsy
"You are an email subject line specialist with 10 years of Substack newsletter experience.
My open rate is [YOUR RATE]%. My niche is '[YOUR NICHE].'
Here are my last 5 subject lines:
[PASTE THEM]
Diagnose exactly why each one is underperforming — specific, not general.
Then rewrite each one using one of four triggers: curiosity gap, specificity, personal stakes, or contrarian angle.
Rules:
(1) Every rewrite must be under 9 words.
(2) No rewrite can start with the same word as the original.
(3) Flag any subject line that relies on vague mystery — those kill long-term open rates even when they spike short-term."Pro Secrets:
After the rewrites, ask:
“Which of these five would you personally open and which would you send to a cold reader who’s never heard of me?” Those two answers are usually different.
That gap tells you whether your subject lines only work for people who already like you.
#Why It’s a Game-Changer 🔥
• Before: You spend 10 hours on your newsletter. You write the subject line in 30 seconds. You wonder why nobody opens it.
• After: You spend 15 minutes on 5 options. The prompt finds the top performer. Open rate goes from 28% to 41% in five sends.
#Advanced Tips: ➠
→ Add:
“Tell me which of these subject lines would make someone stop scrolling their inbox at 7am on a Tuesday.” The specific time and context force the prompt to think about real reading behavior.
❸ G — GROWTH LOOPS 🔄 (No Restacks → fix shareability)
I use this when my content is performing but not spreading.
Restacks are referral engines.
A reader doesn’t restack something because they liked it. They restack something because it’s worth sending to a specific person they already know.
Mini-Prompt: The Restack Trigger.
"You are a viral content strategist specializing in Substack.
My posts aren't getting restacked — readers consume but don't share.
My niche is '[YOUR NICHE]'. Here's my most recent post: [PASTE]
Give me 3–5 specific reasons why this post is not restack-worthy.
Then give me exact rewrites for:
(1) The hook — what would make a reader think 'I need to share this right now'?
(2) One section that should create a 'that's so true' moment for my specific reader.
(3) A closing line that makes someone want to forward this to one specific person in their life — not 'share this with your network.' A real person they're already thinking of.
Rule: Every rewrite must pass this test
— would my reader think of a specific person while reading it? If not, it won't get restacked."Pro Secrets:
The closing line is the highest-leverage rewrite in this prompt.
#Why It’s a Game-Changer 🔥
• Before:
You write a useful post. People read it. Nobody restacks it. You assume they didn’t like it enough.
• After:
You realize the post was useful but not personal.
#Common Mistakes to Avoid:
→ Don’t run this on your best post. Run it on your most recent one. Best posts have selection bias (you already know why they worked). The recent post is the honest test.
❹ N — Network 🔇 (No Comments → fix the engagement trigger)
I use this when posts get reads but no replies.
Mini-Prompt: The Conversation Trigger.
