Learning phase and launching new ads

Okay I have one campaign that’s currently working well and has been for a long time.

I’ve launched new campaigns and I don’t know why but they seem to latch onto a crappy pixel audience and won’t let go.

If I launched a new ad inside my good campaign….like kept the campaign and asset and current the same but just added a new ad inside side the existing adset…theoretically would it benefit from the learning that has already taken place? Or would it mess up the entire campaign including the already successful ad?

Metas AI truly is garbage.