I'm in my late 40s and I found myself single at friendless (for a number of reasons) at 37.
I wasn't really bothered about a relationship but I did want friends. I joined a choir amd was in that for a few uears. I made some good friends through that - male and female - mostly single and we went on holidays and stuff together. Had a really good time for a few years. But slowly they mostly fizzled out.
I had swing dance lessons. That's a really social scene with lots of men and women of all ages. Great for making friends and i saw a few relationships come out of it.
I started going to see live music at a couple of local pubs and met a few people that way. For friendships not dating.
Anyway, after several years making friends etc, starting new hobbies and one thing leading to another, I met someone (totally unrelated to the choir but who I wouldn't have met of it hadn't been for the choir), I started seeing someone last year who I'd known for a few years first.
I went to all of those things alone to begin with because I had no one to go with.
Nearly all of friends (male and female) are in their 50s/early 60s because, tbh, when I was late 30s, they were late 40s and were the ones who weren't still at home doing family stuff with their partners and children!
My point though is that I would suggest going out and finding some social activities that other people do where you can meet people in general. I wouldn't think in terms of meeting someone directly but you never know how your path will run and where you will end up.