Coping with Loneliness After Divorce

I have alot of acquaintances, but very few friends. I try to get out for a walk someplace every day, and unlike the past, try to be nice to people. I'm also in recovery. Most of my original circle is gone, as in dead. I'm almost 51, am bi-polar with childhood PTSD and ADHD, with neurological conditions, have had a heart attack and two strokes. I never got to get married or have kids. Have been clean and sober for 3 years. Not a big upside, to any of this. I don't really know how to make friends anymore