I'm in a similar but somewhat different place. My friends are from teen years, teaching (now retired), and places I used to live - but none lives closer than two hours away. One friend I met in an AOL chat room, "During Divorce" 22 years ago! We all text, email and chat on the phone but I'd like some local friends. My parents are gone. I'm close to my sons and see them, mostly around birthdays and holidays, but they have jobs and SOs to focus on day-to-day , as it should be.
I think the key is finding things to get involved in that are of interest to you. That way, even if you don't meet anyone interesting, at least you're doing something fun or creative or helpful to others. A few years ago I did go to various groups and classes dealing with politics, vegetarianism, swing dance, writing, older singles, etc., hoping to connect to a few people but I think I gave up too soon. My dad died, I got depressed, and a few months later the pandemic hit. I'm planning to make the effort, again, once this current wave has passed.
I'm looking for T'ai chi, animal rescue, creative writing, English country dance and painting opportunities. Crossing my fingers it works this time! Good luck to you!