I know a number of people outside of software engineering/tech that are going through this. Since COVID, many people have learned (the hard way) that community is important.
Try meetups (even meetup.com). It only takes one person you meet to stick and become a friend, and that's 1000x better than where you started. Keep doing it, go to random meetups and things where there will be other people open to making friends. You don't need to actually be interested in whatever the activity is (though many meetups are at bars), it's just an excuse to meet people, just like college was.
Try standup comedy clubs/shows (the small ones). These people are usually friendly, and people usually stick around to chat afterwards. You can meet people easily this way.
Eventually you or someone you meet will ask to do another activity together (maybe food, maybe golfing, who knows). You could even make it a regular thing over time. This kind of thing builds the sense of community you're looking for.
Wanna feel good tomorrow? Go to a few stores (or similar) and make small talk with some cashiers. Try your best to engage and be nice. You may not meet a friend this way, but you'll connect with others in your community around you, which will certainly help.