We've been physically separated by car dependency and the removal of free/cheap meeting spaces; distracted by the internet and streaming media; made to hate and fear each other by propaganda; and made temporary in our neighborhoods by rising rents and the hunt for the ever more rare decent job. That's why.
One way to meet people is to get a dog and walk them around the neighborhood. Another is to find local activity groups over discord, meetup, etc. Another is continuing ed classes at a local university or community college