missing music after changing phones
Hi everyone-
I just got a new iPhone 12. Transferred everything from my iPhone X, without any trouble. Then I started a trial of Apple One. But after much debate, I signed up under a different Apple ID (long story, maybe a big mistake). And I also turned off iTunes Match. So, lots of changes at once, unfortunately. But now I've noticed that a lot of my playlists are missing. It's the same on all platforms (iphone/ipad/mac). They're in sync- and missing a lot of music. And I tried logging back in to the old AppleID, and still didn't see the music.
BUT- I still have my old phone. I just turned it back on- and all the music is there!! So my question is- how do I get all these old playlists out of my old phone and into my new phone?? Can anyone help? I don’t know if the problem is the new phone (I sort of doubt it) or turning off iTunes match (quite possibly but i'm not sure how to put it back), or the change of AppleID on my music account. Some of my custom playlists are there, so it's not like everything is gone. Just some of it. (including the one I really want....)
iPhone 12, iOS 14