[InclinedPlane]

Yeah, I don't think this is exactly rocket science. I'm a pretty introverted and socially anxious person normally (so I don't like hanging out at random parties or talking to complete strangers or whatever) but I've made quite a lot of new friends consistently year over year. All it takes is putting in a bit of effort to do it. Engage in a few activities now and then, keep in touch with people, organize a thing once in a while. It turns out you can make lots of friends via friends of friends, coworkers, people you meet through various activities, etc.

If you put no effort into it of course nobody is just going to randomly insert themselves into your life. And as you get older you don't have those common experiences of intermingling with lots of other people of similar ages or demographic backgrounds due to school, growing up, and so on. So put a little effort into it.