I "quit" in Legion, after playing all previous expansions. I don't regret the time I spent in the game, I had genuinly fun all the way through WoD, but Legion killed it for me and BFA is not much better.
I still log in a little, mostly for nostalgic reasons and I tend to do each raid a little, cause that is still fairly fun, but I no longer really care about the game and collect things like I used to. I dropped from top 50 most achievements worldwide to like top 10000 now, but it's fine
Things change and I found joy in other games instead. You just gotta decide how much you wanna play.