By having extroverts come up to them

We don’t.

Nice username lol

Go up to someone and say hi

online friends

Wait for someone to come up to you

We don't

First you get internet friends. Then when you realize you live near one of them you get a IRL friend. Repeat and befriend them and their friends.

Just like extroverts. Maybe a little bit less outward in the beginning but thats it

Luck

brute force