Ad sets impacted by fragmentation

I’ve been running meta ads to promote my music this year, following the advice of Andrew Southworth and other YouTubers - very grateful for all the wisdom they’ve been sharing, meta ads is such a minefield for the uninitiated!

I typically structure my campaigns with 2-4 ad sets, each having a few ads (that are identical between the ad sets). Every time I get an alert from Meta that my ad sets are impacted by fragmentation, which I understand means that the ads are competing for the same users. Not ideal.

How do people deal with it?

I have a suspicion that the right way is to run these ad sets in an a/b test configuration. Am I on the right track here?

I am also wondering why no one is talking about that. Is that too complicated to explain or that’s the “secret sauce”?

Merry Christmas and happy new year, everyone!