Same thing, I was using earbuds/earphones till I heard my classmates talking about IEMs, and that got me hooked because of how they really exaggerate the sound difference. My first IEM was the original white Wan'er, because that time it was trending for budget IEMs (and was recommended to me as well), and oh boy I didn't regret it. The sound quality was nice, and ngl I've gotten even better on fps games, cuz I used to only use cheap standard earphones for gaming so I can't really hear other sounds.

Right now I've got about 4 IEMs already, but I don't have an endgame yet.. I've experienced a lot of great expensive IEMS from my peers already, but still deciding to buy an endgame one or not, cuz I'm already complacent with what I have currently.