I found English meetups to be an incredible source for meeting younger people around my age pursuing varying careers and interests, especially when the culture prevents you from talking to strangers in most situations.

You're in the US so there's probably not English meetups, but there's probably an Esperanto interest group or you could try to find a group for another language you're learning.

I haven't personal been to SF but I figure you there's SIGs for a tech stack you like.