I have a hard time playing anything but World Of Warcraft (when it comes to MMOs). I always gravitate back towards it (usually only for a couple of weeks every few years). No other MMORPG has really clicked for me.
What I can recommend though for anyone whose favourite WoW was Classic (or any of the earlier expansions) is WoW Classic Hardcore mode. It brought me back playing WoW again for much longer than any of the previous expansions managed to.
I like WoW, but I only play on private servers in hardcore like you. What I prefer in a MMO is the story and the levelling, so I didn't get a lot of fun on the normal WoW but the hardcore mode make it fun, it touch my love of roguelike