First reduce consumption, then re-use what you can, then recycle everything possible of what's left. Promote this practice in your community and workplace. Besides voting, recycling is currently one of the few ways we participate in public life on a mass scale voluntarily. Write letters to the editor. Write a song.
Political songs are great tools for organizing and inspiring people.
Learn about unions. If you don't belong to one, get someone who does to explain their purpose, history, and current status. Unions are where many of the most important political battles of our era were fought - and often won. Get to know your neighbors. It's hard to reclaim politics without some sense of community.