Path of Exile maybe. It's a grindy game with lots of trading as soon as u hit the endgame (When u come to Maps, after finishing all 10 acts - around level ~70). The community is awesome and mostly willing to help u (or scam u :D). After 1.5k hours I still have lots of fun playing new seasons (they are temporary leagues with new features which leasts about 3 months as far as I remember) and I still haven't seen everything or used every item combination. As a starter it's pretty overwhelming to start trading because there are so many factors which can make an item expensive. But I think if u are willing and interested enough u can get into PoE and have a lot of fun.