Volunteering is a good option for me. Shared struggle/suffering is a known catalyst for friendship. You could look at public works type volunteering, such as v

Volunteering is a good option for me. Shared struggle/suffering is a known catalyst for friendship. You could look at public works type volunteering, such as volunteer trail crews, if that kind of thing interests you. Working hard together to build or care for something is a way to bond, and gets you physically active too which is good for happiness & mood.