Your test probably didn't break your Meta ads
Every time someone tells me their A/B test killed their CPCs, I ask the same question: did you check what your CPCs were doing before the test? Had a merchant convinced their test caused a spike. When we actually pulled the data, their account was doing the exact same thing the week before. No test running. Same pattern. The "spike" was just their normal account behavior they'd never noticed. CPCs are noisy. They move around constantly. Most of the time when you launch a test and see costs go up, it's correlation not causation. Before you kill a test, pull your hourly data from the same time period last week. Compare like to like. You might be surprised what you find. Anyone else blamed a test for something that turned out to be normal account behavior?