What most naturally follows?

How to travel the world as an introvert
Identify what sort of travel experience you want to have.
Introverts are not a monolithic community. Some introverts enjoy socializing for several hours a day, while others prefer far less socialization.
Some don't mind crowds, while others would feel uncomfortable packed onto a subway tram like a sardine in a tin can. Be realistic with yourself and think about what sort of travel experience you want.