If you have the means: Start hosting. Contribute (code, tutorials, docs). Spread the word. Contribute funds to projects. Answer support questions/GH issues/forum posts from people who are having issues.

When it comes to people you know and interact with, start with the “low-hanging fruit” (individuals who have skills/interest in technology or are already agreeing about the problem).

I used to be outwardly and loudly critical of the system and people supporting it, but that got me nowhere, just isolated. When I stopped all criticism and just started aligning my life how I would like others to live, I finally started to get somewhere.