Recruit the neighbor to make a tiny library with you, set it up, and then begin filling it with the types of books they should be reading.

I think you should actually talk to him. Do avoid calling him out, but ask him a few questions. From my experience, right-winger usually recognize that there are things that are fundamentally wrong in society. They often get to an inch of attaining class consciousness before concluding "It's the minorities' fault" or something like that. If he doesn't already believe that, it shouldn't be hard to convince him that capitalists are bad (if not capitalism as a whole). Try to focus on the filthy rich ones first, lest he become defensive. Avoid focusing on the individual characteristics of capitalists, and more on their behavior as members of a class.

If you've done some reading, it shouldn't be hard to find more plausible reasons for society's ills than the ones he was taught. Just take it slow, seed some doubt in him and let it grow on its own. If you give him a good basis, he might very well reach a close to communist conclusion on his own, which will implant those ideas much more firmly than if they'd been fed by an outsider.

However if he's the billionaire larping kind, I'm afraid there's nothing I can say to help you.

Sounds like a golden opportunity. MAGAs are usually so painfully close to class consciousness but the stupid political ecosystem you all have over there makes everything adversarial and so they dig in and cover their ears when they anticipate interacting with someone such as a communist. Being neighbours with one gives you the opportunity to build a rapport with them without them reactively closing their minds off and othering you. It's a fantastic opportunity, so long as you haven't already othered them first.

Bro, is that Maoist Mario picture official? Where is it from?

Break into their house and inject egg yolk into their furniture.