After a few years we started valuing friendships more and more. I don't have any solid tips other than making it a genuine priority and treat it like an ongoing project. Learn how to make contact, get better at approaching strangers, etc. That said, it is nice to eventually settle down and build longer lasting friendships, though those you build on travels don't have to disappear if you keep in touch and revisit each other. I think I've learned it's better to have a larger and wider variety of friends even if some are distant than a smaller homogenous group of friends.
