I'm adventure level 28 going on 29 now.
Progression slows a lot; I'd been binging the game pretty hard since I'm NEET right now, but I had to slow because I can't go faster without paying at this point.
I will not pay a dime; I will not buy the pass, so I can't attest to it being worthwhile; it's ultimately your choice, but I wouldn't advise it because it doesn't seem wholly necessary unless you really wanna power through the game.
Anyhow, I take issue with the whole resin thing, but ultimately the fact that the amount of stuff I can do on any given day is limited has promoted a healthier lifestyle for me.
I can't just keep binging the game straight through to the cruel and bitter end because it prevents me from doing so,
so I just hop on and do my commissions and the domains if they got what I need and leave it at that; it's fun enough that way.