Optimize · Subject-Line & A/B Variants

Generate Follow-Up Subject Lines for a Stalled Thread

Resurrect a stalled prospect thread with 7 follow-up subject lines that don't sound desperate or templated.

repmanagerIntermediate⏱ 30 min
When to use
Use this when a prospect opened and replied once or twice, then went silent for 7-30 days. Standard "following up" or "bumping this up" subjects get archived. This prompt writes 7 variants that re-open the loop with new information, a softer ask, or a graceful break-up — and tells you which one to send based on how cold the thread is.
The prompt
You are a cold-email specialist for a digital marketing agency. You know the difference between a follow-up that earns a reply and one that earns an unsubscribe.
Agency: [AGENCY_NAME] — [SERVICES] | Last email body: [LAST_EMAIL_BODY] | Last prospect reply (if any): [LAST_REPLY] | Days since last touch: [DAYS_SINCE_LAST_TOUCH] | Original subject of thread: [ORIGINAL_SUBJECT] | Prospect: [PROSPECT_NAME] at [PROSPECT_COMPANY]
Write 7 follow-up subject lines designed to re-open a stalled thread. Pick whether each one keeps the original thread (Re:) or starts a fresh thread.

- Max 6 words
- No "following up", "bumping this up", "circling back", "just checking in"
- 2 variants must add NEW information (a new finding, stat, or example)
- 2 variants must soften the ask (shorter commitment than original)
- 1 variant must be a graceful break-up
- 1 must be a question reframing the original offer
- 1 must be ultra-short (≤3 words)
- Mark each: (THREAD) keeps Re:, (FRESH) starts new

Numbered 1-7: subject — (THREAD/FRESH) — type — rationale. Recommend send order based on [DAYS_SINCE_LAST_TOUCH] at the end.
Variables
  • [AGENCY_NAME] — Your agency
  • [SERVICES] — Services offered
  • [LAST_EMAIL_BODY] — The most recent email you sent
  • [LAST_REPLY] — Their last reply, or 'none' if they ghosted from the start
  • [DAYS_SINCE_LAST_TOUCH] — Days since last activity in thread
  • [ORIGINAL_SUBJECT] — Subject that started the thread
  • [PROSPECT_NAME] — First name
  • [PROSPECT_COMPANY] — Company
Example input
Agency: PixelBarn — web design + Webflow dev for B2B | Last email: offered a 20-min audit of their homepage hero | Last reply: 'interesting, send timing in 2 weeks' (then silence) | Days since: 24 | Original subject: 'klario homepage hero' | Prospect: Maya at Klario
Example output
1. klario hero, take 2 (WINNER) — (THREAD) — soft ask — picks up where she left off.
2. found a faster fix — (FRESH) — new info — fresh hook, no thread baggage.
3. 10 min instead of 20 — (THREAD) — softer ask — drops commitment by half.
4. one heatmap finding — (FRESH) — new info — concrete new evidence.
5. should I close the loop? — (THREAD) — graceful break-up — invites yes/no.
6. still worth a look? — (THREAD) — question reframe — low pressure.
7. klario? — (FRESH) — ultra-short — pattern interrupt at 24+ days.

Send order: #1 day 25, #3 day 32, #5 day 45.
Pro tips
  • Switch THREAD to FRESH after day 30 — inbox providers down-rank old threads.
  • Never send 2 follow-ups in the same week; cadence matters more than wording.
  • Always end the sequence with the break-up — it pulls 15-20% of dead threads back to life.
Works with
ClaudeChatGPTGemini
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