>>520687006 (OP)
>What does the Republican party have to do to win back support from online outlets like 4chan?
There's a lot to unpack here. For example, your question presumes that 4chan (the whole website) ever supported *the Republican party* as opposed to just Trump/MAGA wing of the party, it also presumes that this support was lost, and that this support is valuable enough to be worth going out of your way to regain. All those claims would need some supporting evidence before you could be given a useful answer in good faith.
That said, I'll weigh in anyway. I find it unlikely that a majority of users of this website ever supported Drumpf or the GOP, especially not all the foreigners, but I think people who are here to be politically incorrect (as opposed to the many people who are here to turn this website into plebbit by imposing political correctness upon it) still do broadly support anyone who is politically incorrect and always have. I would wager that the proportion of Oldfags who genuinely support the Rainbow Raytheon globohomo orthodoxy is pretty small, and I'm quite sure that there aren't many single-issue voters whose single issue is Israel on this website except literal muslims. I have seen no evidence of any erosion of support for Drumpf among the intellectual core of his memeologists on this website who act as a kind of shadow-cathedral disseminating memes, ideas, and obscure policy issues to xitter from which they reach government officials up to and including trump and Vance themselves.
Tl;dr: I'm unaware of any erosion of trump support here, not are users of this website electorally significant except in transmitting information and ideas to politicians we support which they otherwise might not have been aware of. Orange Man's internet people are important to the broader culture war online which feeds into and influences political outcomes, but rarely ever electorally decisive I think.