Can you move to a city? This is what most people I know in this situation do. Though I had a great time getting a car and taking myself out for hikes, sauna / spa days, activities and parties in the east bay near SF. Great place for practicing being alone. I had to think about it like dating myself - where would I have taken a date for fun? Try a bunch of things and see what sticks and remember you can appreciate moments by yourself with this mindset and it's like 80% as good.
Ironically I find cities more isolating than the countryside. At least in the countryside you have the beauty of nature. In many modern cities, there is less and less social connection and community. Sometimes I suppose it is finding the right groups... And sometimes you have to take the initiative and create in person groups.
The suburbs, though, are the worst of both worlds.
Cities at least are full of a huge variety of people looking to make connections.
Depends on the suburb and HOA. Mine has groups for books, card games, mahjongg, cycling, ladies lunch, men's lunch, happy hours, pickle ball, etc... Some are in our community center, some are hosted in people's homes. There are also occasional block parties, although they tend to revolve around kids.
+1 Moving to a city.