Audit list for suitability, run a "life stage change" re-engagement email, retarget warm cookies with fresh creative, and prune non-responders after 2-3 touches.
Playbook
1. Segment cold (90d+) leads by original interest 2. Send 3-email re-engagement with new value (stat, case study, tool) 3. Meta/LinkedIn retarget warm cookies with fresh creative 4. Prune non-responders and remove consent-expired contacts
Ratio
Expect 5-15% to re-engage; the rest are better removed to protect deliverability.