Al Anon is a great plan actually.

My good friend is single no kids, no partner, and no family, except one brother far away. She recently retired and she also has some on and off anxiety. There are particular things she does that keeps her busy. Book clubs. One in a local library and one through meet up. One through meet ups also turned out to form travel group so they go to small trips annually. She plays volleyball in a community center. She also signed up to be literacy tutor at a community center. She thought she’d be tutoring adults but she’s been tutoring a little boy twice a week, it’s very rewarding. she might tutor more kids. She has a small group of friends, me included, and we do things together. We’ve met through meet ups years ago. That group doesn’t exist anymore but we remain friends. We separately belong to different groups now.

If not meet ups, check what they offer at community centers in your area