Get involved. It feels a lot better than doing nothing. It won't be easy, and it'll take time, but things will happen. Get a friend involved, too.

Wherever you live, there's probably an Indivisible group, and a group of Democrats. Those are decent starting points; both are big groups with room for policy differences within them.

This book isn't bad, either: http://amzn.to/2E4mQze