A few things that are accessible within the USA include:
- Participating in mutual aid programs
- Campaigning on the local level, including for positions like poll watchers
- Making your voice heard in community events in general
- Joining your local DSA, networking
This is the entire issue on the left and why they can never actually organize and run real candidates. While the left is busy arguing about the best way to organize the workplace the right just says “this guys (cold, lifeless) heart is in basically the right place” and pulls the lever.