Library/Outreach & Messaging/Email Rewriting & Optimization/Subject Line Diagnostic Low Open Rate Approach Rating Rewrite Better Version
TestedOutreach & MessagingQuick Win (under 10 min)

Subject Line Diagnostic Low Open Rate Approach Rating Rewrite Better Version

Identify why a subject line isn't performing and generate tested rewrites across different angles and approaches.

About this prompt

This prompt analyzes an underperforming email subject line, diagnoses the likely reason for low open rates, and generates multiple rewritten versions across different angles and tones. It's built for AEs, SDRs, and sales managers who are running email sequences and need to iterate quickly on subject lines that aren't converting. Use it any time an email in your sequence is pulling below expected open rates.

The prompt

Review the following subject lines from my cold email campaigns and diagnose why they might have low open rates. For each subject line: 1. Identify what approach it's using (curiosity, benefit, person
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Variables to replace

LIST YOUR SUBJECT LINES

How to run it

  1. Copy the prompt and paste it into Claude, ChatGPT, Gemini, or Copilot — it's tuned to run in any of them.
  2. Replace the variables — swap each bracketed token for your deal's specifics. The variables list above explains every field.
  3. Make it yours — run it, keep what's strong, and tighten your inputs on the next pass. The prompt improves with your context.

What good output looks like

Make it yours

StageProspecting
SeatSDR, BDR, AE
DifficultyIntermediate
Time to valueQuick Win (under 10 min)
Works withAI-Agnostic
CategoryOutreach & Messaging
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Stop rewriting. Start closing.

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