Being forced to work for billionaires keeps us from leading more fulfilling lives

Organize movements of workers, tenants, etc. Build up support & experience, establish a program of things you want to accomplish, then organize various actions up until you have enough power to strike

It’s not a single, neat answer. Decades of history led to this point. One interesting entry point: https://thedigradio.com/podcast/counterrevolution-w-melinda-cooper/

Yup. This is the basic principle of anarchism.

Use resources available through your library’s website

Meet people where they are to make change

They just don’t work well. There’s no technique

Get involved in a hobby that has a welcoming community: photography, book clubs, cooking classes, running clubs, maker spaces, etc. If you really believe you have agoraphobia, consider speaking with a therapist (most work over video chat).