The best way to protest against reddit is simply to not interact with Reddit
I see a lot of posts about how they uploaded anti-spez stuff onto reddit, or participated in the nsfw spams/john oliver spams. While I get wanting to let it all out, this ultimately keeps up engagement on reddit rather than bringing it down.
The best way to make sure things go your way? Vote with your wallet, or in this case your voice. Don't speak on reddit. Devote more time helping out the alternatives grow and flourish. And as much as it is a meme, touching some grass can help your mental fortitude.