Thanks so much for all these tips, and I'm going to find that thread.
I think I have been doing lots of what you all mentioned, I just need to persevere until I find something that is a good fit. I made myself go to a women's cycling group today and felt much better for it.
I also think I want the end result now -amazing connections and good laughs -which isn't going to happen without time and effort.
If it helps anyone, I got chatgpt to make me a handy list of the suggestions:
Book clubs (very social)
Volunteering
Choir
Craft groups
Political party activities
Mixed-age socializing (don’t focus only on friends your age or with the same background)
Team sports (e.g., netball, hockey, with lively social aspects)
Knitting groups (e.g., meeting at coffee shops to knit and chat)
Social and community events (e.g., clean-up initiatives, village litter picks)
Local pub, wine bar, or café gatherings (go and talk to people)
Couch to 5k running groups (good for socializing while exercising)
Church groups (including free churches with younger crowds)
Keep any more suggestions/success stories coming!