>15 close friends, 50 regular contacts, 150 active acquaintances

Seems like a lot. For me, it's 0 close friends, 0 regular contacts, and 0 active acquaintances. I think I simply never developed any useful social skills which would help me make and keep friends or acquaintances. I wish I had (somehow) kept in touch with at least some people I have met throughout my life. It has never been easier to stay in contact than in all of human history, but no, I had to ghost and ignore everyone and everything. After 29 revolutions around the sun, I have only now started to realize that all that vacuous superiority has led me nowhere. There is only a faint aftertaste of missing out, which sticks to me like tar. I can’t wash it off.

You still can. Most people have more and less social periods of their lives. I have plenty of _very_ social friends in their 40s/50s who weren't as social in their 20s. Or the opposite. Life is long, and many of us need decades focused inwards with others focused outwards

My advice is to go somewhere in person and to keep going there consistently. It could be a club, a meetup, volunteering, etc.

The internet is the fast food of socialising. While it might be quick and easy, the quality is terrible. You’ll make real life long friends just being in the same room as someone regularly and chatting face to face.