I remember having dozens of friends in school, since I was involved in half a dozen sponsored activities.
Even in college, those extra curricular activities (and classes forced group work, science labs) is where I met most of my friends. But I did notice the count going down, I figured I was too busy with my work.
Nowadays I'm 100% WFH, and have zero friends in any sort of physical proximity to me. Yes I'm single too, of course. I go out to eat every day just to have a chance of socializing, and to people-watch. I visit the sketchiest Walmart in my city in case something interesting happens, and to people-watch.
Otherwise, I might as well not exist. If I died, my immediate family (parents, siblings) would be the only people to notice (after the county calls found my body, anyway), and maybe a friend or two from high school would drop in for the funeral.
What happened? I'm an extroverted Leo, so unlike most lurkers here, I actually consider this a real problem in my life.
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I've spent a lot of time thinking about this, and I've realized a solution: drastically changing my living situation, and going out to bars more, is likely to be a reasonable plan to "make a lot of new friends" as an adult.
Think about it: what do most, non-autistic people, who don't-use-computers, do on the weekend? They go to bars! They probably get laid, too!! The only apps on their phone are probably facebook, tinder and a sports betting app!!!
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While we're all complaining about this, there are tons of people who use their smartphones to socialize every day. *What are they doing that we don't?*