Lift phrases directly from calls, reviews, and community threads, then group them into interest stacks that mirror how people describe problems. A “Sunday Night Dread” cluster might outperform generic “productivity” bundles. If that happens, you have a psychological foothold, not just a demographic guess. Keep each stack clean, document the sources, and reuse the language in ads so continuity reinforces credibility.
Seed lookalikes with users who completed meaningful actions—activated trials, high LTV purchases, or repeat engagement—not mere page views. Smaller, cleaner seeds often produce steadier CPM and better downstream conversion. Compare 1 percent and 2 percent ranges against your broad control. When a seed consistently wins, you have a durable anchor segment whose characteristics can shape creative cues, onboarding flows, and even product priorities.
Running a broad cell alongside every test keeps you honest. If your fancy stack loses to broad, the algorithm may already understand intent signals better than your filters. Treat it as a compliment, not a failure. Lean on creative differentiation and landing page clarity, then reattempt narrower slices later. Broad protects exploration from overfitting and routinely uncovers segments you would never have named.
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