For me, it was Chainsaw Man. I’d read a few manga years ago, most of Berserk, some Junji Ito, and Naruto way back as a kid, but none of it really stuck for me. And then I stumbled unto the Chainsaw Man anime, loved it and checked the subreddit, saw a ton of manga spoiler memes that made me feel like i was missing out, so I read the entirety of what was out, figured out manga is pretty dope, and now I’m working on reading Monster and One Piece
Oh I love FMA, I’ve watched it twice I think. I’ve got the first volume somewhere but haven’t gotten around to it. It’s always my first reccomendation for people new to anime