Since you’re here I’ll assume you’re a nerd and suggest getting into Magic:the Gathering. You can learn to play on Arena for free and then buy a pre-made commander deck. At that point you can go to local game stores and ask when they have open play nights. The nice thing about magic is that the games take a long time to play so there’re a lot of opportunities to socialize with the people you play with and people nearby. Similarly if you can find an active Killer Queen cabinet around you those people are always desperate for players and it’s super fun

If you’re less of a nerd dance classes are more active and likewise force you to be in an intimate space with someone which will usually force you to socialize. You seem opposed to bars but karaoke crowds tend to be the same week after week, and you have to wait your turn, so it’s another socialization venue