How to curb capitalist realism?
Capitalist realism: the belief capitalism is the only viable system, or at least the only one compatible with modern human rights. You don't believe that here, right?
I think we'd need to create a living example of post-capitalist society e.g by reforming some country; most people don't fight for unproven futures. We mustn't lull anyone into believing the reward will be either perfect or instant, or they'd cherrypick any homelessness or corruption on our part as "proof" our system doesn't work even if they have it too.
I don't consider capitalism either the best possible system nor some supernatural evil; either would be reductive, and I don't have to downplay the vast good that has come from capitalism to imagine an even better way. While I know the bad parts of capitalism, framing them as capitalism-specific would stop us from solving them assuming they transcend any one -ism.