Individual consumption choices definitely matter [1], but working alongside others in your workplace and community is even more impactful. It's a longterm bet, but if you start talking with others around you about their own conditions, I think people will eventually start to see the parallels. Imagine if American workers refused to support trade deals unless they included rights for workers as part of them, for example. But it starts with recognizing that the people around us are in the same boat.

[1] I am currently resisting buying an iPhone XS even though I really want one, because I'm trying to work on mine.