If you want change, you need a critical mass of people to demand change.

If you want a critical mass of people to demand change, you have to recruit people to that critical mass.

And you recruit people by talking to them.

You do not have zero control. You vote with your dollars. You vote with your actual vote. And most importantly you talk to people to get them to vote with their dollars and their ballots. When you commit to a cause and you live the values of that cause, you can convince other people to commit to the cause, and they convince other people to commit to the cause, and so on and so forth. That's how collective action works. That's how all political change works. This is how you force billionaires to stop polluting and get laws passed that actually help the climate - by getting enough people to support climate action that politicians and businesses have no choice but to yield.

And you do this by talking to people.

Christ, the same people who insist get out the vote efforts work will tell you talking about climate change is useless, when it's the exact same phenomenon - individual action inspiring more individual action and ultimately becoming collective action.