Behavior of PMAX campaigns

Guys, two days ago I made some changes to my campaigns. I had my PMAX with all products included, about 1,600 variants. I created a mid and low campaign and left only the best-performing products in the initial PMAX. However, since making these changes, both the original campaign and the two new ones have been performing terribly. In this case, should I wait to see if performance improves, or should I relaunch the PMAX with the best sellers, which is currently the worst-performing one?

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