What kind of friendships would you like to have? Deep, meaningful, casual, lunch pals, common goals?
If I wanted to make friends, I'd go to the local historical societies, or the museums. I usually talk to people at the antique and thrift shops. I run into friendly people at the library.
Any of the community organizations need volunteers. Aside from filling your time, doing something you care about, you meet like-minded people. If you take a class at the community college, you'll probably make friends. I took a class over 20 years ago. One of my neighbors was in the class. I didn't know her until she said we were neighbors and we've been friends ever since.
I have friends through volunteering at the Dem headquarters. When I go to the protests, I know many people there, and meet more every time.
If you are a car person, there are usually Cruise-Ins in nice weather. The car owners are friendly.
Any of these are starting points. If you enjoy the company of someone, let them know and be willing to give and take to develop a relationship. My most recent friendship to take hold is with a mutual friend of my best friend who passed away almost 2 years ago. We had that friendship in common and have been getting to know each other the last few years, mostly phone calls. Our friendship was born in grief, but is growing from those ashes.
And you always have DUers
There are a few people here who I consider friends, mainly because there has been give and take in our posts, that bonded us. I might not meet them face to face, but they are in my universe.
Hang in there. You are never alone.