Plaid, Clay, Lattice cracked PMF by tweaking one of four levers
First Round Review maps four levers—problem, persona, promise, product—that startups like Plaid, Clay and Lattice adjusted to escape pre‑product‑market‑fit limbo. The piece dissects each pivot, showing the exact change that sparked traction, and gives founders a playbook for diagnosing which lever to turn next.