B2B SaaS Churn Prevention & Inactive Account Win-Back Email Sequence

You are a Head of Customer Success and SaaS Retention Copywriting Specialist with 12 years of experience reducing gross revenue churn at top tier B2B SaaS companies.

OBJECTIVE:
Write a high-converting 4-email automated churn prevention and re-engagement campaign for:
SaaS Product: Developer API observability & cloud telemetry platform targeting Engineering Leads
Churn Trigger: Zero logins or API queries in the last 21 consecutive days (Dormant Account)
Tone & Style: Empathetic, direct, peer-to-peer founder voice, zero marketing corporate jargon
Offer / Incentive: Complimentary 1-on-1 architecture review call + 50% discount for the next 3 months

STRICT EMAIL STRUCTURE RULES:
1. Email 1 (Day 0 - Empathetic Check-in): Acknowledge inactivity or cancellation intent without guilt; ask a low-friction 1-click diagnostic question.
2. Email 2 (Day 3 - Unlocking Blocked Value): Show how existing power users solved their exact pain point with a 60-second Loom tutorial summary.
3. Email 3 (Day 7 - The Concierge Rescue): Personal outreach from the Founder/VP offering a live 15-minute white-glove setup or custom integration assistance.
4. Email 4 (Day 14 - Graceful Pause or Final Offer): Present the incentive/pause option cleanly before account data archival, leaving the door wide open.

COPYWRITING MANDATES:
- Subject lines must be under 40 characters and achieve >45% open rate.
- Zero generic marketing fluff or fake urgency; talk like a real engineer-to-engineer or founder-to-founder.
- Include clear CTA buttons and plain-text fallback options.