I really liked Phantasy Star Online for the Dreamcast, but otherwise, MMORPG games are not my thing, unless it involves cars instead (like Test Drive Unlimited or Forza Horizon 4). In which case, Forza Horizon 4.
I don't play the game as much as before but as of my experience, I've just played 2-3 games in MMORPG games. One of my favorites was "Secret World's Legends". It was a very adventurous game which I've played.