Which old-school MMO would you revive if you could, and why? Is there a classic game you miss, or one you think the serves should be back online.

Classics still hold a special place in our hearts, right? If my favorite childhood MMO came back in a modern-day revival, it would be amazing but maybe it was the sense of wonder in its world-building, the community vibes, or the gameplay mechanics that made it special and would not be anymore. What are your thoughts? ( my favorite MMO is the classic Maplestory btw )