Build 1-2% lookalikes from your best-converting clients (high LTV, retained 24+ months), refresh every 30-60 days, and exclude existing leads for incremental reach.
Best-practice
- Seed: high-LTV client emails (1,000+ for quality) - Size: 1-2% for quality, 3-5% for reach - Refresh: every 30-60 days as client list grows - Exclusions: existing leads, previous low-quality converters
Impact
25-45% lower CPL vs broad interest targeting in most tested niches.