VRChat! I recently invested in a VR headset + full body tracking and I have a blast for hours on hours just hanging out and talking to people. Sometimes I'll visit worlds alone and just interact with the environment, like amusement parks, restaurants, game worlds, go carts, etc. It's amazing the amount of stuff you can do in it and the people you meet. (Although you have to be careful cause it's full of awkward children depending on the worlds you go into e_e I just avoid/block them asap lol)

And honestly even if you don't have a VR headset, the desktop version is still fun to go on to try out different avatars and roam worlds. My bff did it for awhile until she got a VR Headset.