All of this is sad but true, especially the part about how conservatives have hammered home very simple narratives like “liberal” being a dirty, anti-American word. If anyone brings up something that would be objectively beneficial to the average American like universal healthcare, all conservative politicians have to do is cry “socialism” over and over again and voila, the average American will proudly vote against their own self interest because they associate that very simply messaging with evil communism or whatever. Then to your point about media/social media, they will always find some pundit or grifter out there that makes content that validates their beliefs.
It is definitely an uphill battle trying to untangle decades of Fox News propaganda, but you still have to at least try. I agree that the solution needs to focus on tweaking and simplifying the messaging. Identify the handful of policy issues that matter to the average American and then be clear and consistent with how it’s broadcasted. In terms of presidential candidates, I think the next one has to be someone that comes across as more serious and direct when it comes to campaigning. No need to stoop to the Republican strategy of using fear and paranoia to whip people into a frenzy, just someone who can be straightforward and less “meme-y” (for lack of a better word) than Kamala.