What is so hard to make it so my MacBook Apple Music can sync TOO my iPhone

I spent 2 hours organizing and putting all my songs into playlists yesterday on MY MACBOOK. because its easier yk, today I woke up wondering why it's not on my phone(yk thinking how there's a apple sync feature that should share any updates across any platform)

But nope today spend an hour trying to figure out how to sync them.. watch multiple videos and forms on how to transfer Mac to iPhone. But of course, nothing works, and then i turn sync on and off on my iPhone multiple times... NOTHING. Finally, get risky enough to do it on my MacBook... and boom my whole two hours f****in wasted. The dumbest thing i went thru. Thanks.

Just to make this professional or whatever ill ask, is there a way to revert this? i doubt it. Thanks lmao