Adopt a politician. Write a monthly letter to your representative, senator, or president. Invite a school board member to lunch. Sometimes making friends is the most politically effective thing you can do. Eat lower on the food chain.
Food is the most under-recognized confluence of the personal and political.
Eating less meat will positively impact everything from your health to public land management. Fly an Earth flag. National borders are human inventions, but the planet isn't. Pledge yourself to the service of your planet, bioregion, and community. Write to foreign governments.