Find a hobby that can be done either with others or can somehow be social, that you somewhat enjoy.
Then do it and talk to strangers you meet from it.
E.g. You like shooting guns, google "shooting lesseons in my-town", go to local shooting lessons, hunting trips, gun shows, talk to strangers there about it, make friends.
E.g. Go to church, listen to pastor, afterwards talk to the people there about the service, about anything. Friends.