Earlier quoted context omitted.
That is my thinking too. Joining a group of 10 people, maybe with luck I make 1 friend out of it. I’ve done it in the past, with mixed results. My father would roam through different groups, rotary, lions club, church, fathers of my friends… that resulted in a say 1% friendships, which would last from 1 to 3 years. And boy there are dangers there too! Nobody is talking about them! Was I the only one who got a manic h…
And those "manics" are excluded as well, while just showing up, trying to make friends. The solutionism exhibited in discussions like this flies in the face of reality. They devolve into self-help for the masses. Human relationships are complex, and there is no easy path to true friendship.
The solution I identify in my comments does not fly in the face of reality, because it is how I went from being crushingly lonely and weird in my early 30s to having the kind of friends who (just today) said "are you really doing Christmas by yourself? Fly out to and come to us, you'd be very welcome", and they absolutely mean it.
I'm still someone who lives solo and the covid lockdowns were a difficult, lonely time. But I have friends because I found myself introduced to an event on the fringes of a much bigger social scene, and I decided to turn up more and take an active part in it.
You find a thing that is bigger than yourself, whatever it is, you show interest, and you keep turning up. It's not solutionism: it's how friendship starts, for most people. You offer or accept help. You share a task that needs doing. You share an activity that is fun. You expand your personal circle to a dog, and they expand your circle to the owners of other dogs. Whatever.
Of course humans are all different, but essentially all the adults at a grown up social group, community project, activism event, regular club, dog park, have something in common: they are adults who want friendship. That may well be the only thing they have in common apart from their interest in some shared endeavour.