Well, you could have him sell weapons to American enemies, use the proceeds to back a bunch of monsters in another country. That should...wait no he did that.
He could drastically worsen economic inequality by slashing taxes while simultaneously spending more of weapons and...no thst happened too.
Uh...he could ignore a pandemic because he wanted it to kill homosexuals for no reason but bigotry, while disciplining the surgeon general when th man tried to speak out on the subject.No wait. THAT HAPPENED TOO.
Ronald Reagan WAS one of the worst presidents the US has ever had. It’s telling that the most common suggestion so far to make him even worse is literally wiping out the human race.
I thought the OP's challenge was to make sure people actually acknowledged it.
Possibly if you preserved the Fairness Doctrine, or managed to override Reagan's veto (or Bush's threatened veto), you spike conservative talk radio, and that slows down the Cult of Saint Ronald.