To find people, use an app like Meetup. There are also fitness groups. The more people you interact with, the higher the chance you'll find one or more with commonalities. Reach out to past friends, co-workers, etc. You can wish them a "Happy <holiday>'. You can write a 5-word comments on their posts.
I tried meetup once and couldn't find anything in my town. Everything would have required me to travel into the city an hour away. Even then most of it was crafts, hikes, sports or bar meetups. Im not really crafty, hikes are something im kinda interested in but am not in shape right now. I hurt my legs when I was kid and can't hyperextend so most sports have always been kinda out for me and I don't enjoy them to watch either. Don't drink at all so people who drink recreationally dont usually find me fun. I use to really be into cinema but fell out of it after my wife and I got more serious. A board game group would be fun. I enjoy a good game of cards although don't have too much gambling money all the time. I don't usually see things like that posted out there often though. I have reached out to really the only person I have ever considered a friend. We talked for about a week its kinda fallen apart since then. I kinda understand hes coming out a rough time and trying to make a 5 year relationship work so dealing with a sad third wheel right now probably isn't ideal. I'll think about all of these things though. Try to see who I think I can reach out too. that is actually still local.