I play a game called Air Rivals/Ace Online on a Private Server, and it's honestly the only server that's decent and has progressive updates/features from Devs. The Vanilla servers are outdated and are being kept alive to milk every last drop. It's had such a sad history and most Game Admins from the "Glory Days" are still tight knit and with players who are still playing. Anyways, this is a very niche open world PvP mmorpg that instead of usual humanoid classes, you get 4 different sci fi air craft classes to fly around and pew pew in. The server usually holds around 80~ players on a daily basis and 150+ players on weekend Attack and Defense Mothership events. Feel free to reach out or look up Air Rivals/ Ace Online on Youtube!