Welcome back!
I don’t know what to tell you, because I don’t know what you like.
You only played WoW during Legion? What did you like about it? What have you liked in other MMOs? Questing? Dungeons? Raids? Something else?
You might try joining a Community, like this one, which is very friendly:
But whatever you do, you will probably have to get to 120 to join in. Almost everyone who plays is at 120, and it’s hard to arrange parties for people below that, because they will be at different levels.
Gearing up at the moment after hitting 120 is mostly handled by questing in the new zones Nazjatar and Mechagon, which give very fast catch-up gear. After that, you would go on to high level (Mythic-Plus) dungeons and raids, ranging from a very easy, queued Looking for Raid, through three other levels of raid.
If that doesn’t convince you, you might also consider waiting for Classic, which launches end of August. Much more with the questing, but also dungeons, and we all hope it will attract a much more social community (after the first weeks of mass overcrowding and chaos lol)