I'm about to print off about a million of those "I did that!!" stickers that the magats loved to stick on gas pumps. You better believe those things are going everywhere.
I don't want to put blame directly on individual voters, in the sense that they might be able to learn in 4 years, and "Trump did that" only addresses the symptom of the problem. "MAGA did that" sounds apt to me.
I'm already too optimistic but perhaps a more direct awareness campaign on how climate denialism, economic isolationism and anti-immigration stances hurt themselves, their friends family and neighbors, and directly make their lives worse.
It has to be kept simple, and packaged like a low-effort meme. Anything too wordy or think-y won't go viral in the circles that need targeting.
Maybe we need some fake Facebook pages. Start by reposting crap you already know they'll share. Once the audience is there, start slowly slipping actual facts into things. It's gotta start slow, though. The "long con."