I think most of the people you're referring to have, in some way, shape, or form called "Americans" and our leaders to task in recent years. Some of them more directly pointedly at Trump/Trumpism, others just the general political climate. Each and every time, it starts very loud backlash, support, arguments, etc...
I would imagine most of them just don't know what to say or do at this point.
And one of the main reasons Trump even "exists" is because Trump supporters believe the leaders you mentioned basically ignored, even crapped on them, for years. So they aren't going to convince many of the Trump Republicans of much of anything.
I think we need someone like DeSantis to rise from Trumpsewer, and slowly distance himself from the BS. Trump, as a viable political leader, wasn't created overnight. And "he" won't be destroyed over night. Even if he is charged and convicted with whatever crimes might have happened...he'll still hold power over millions of voters. Maybe even more power!
Someone that holds a lot of Trumps policy beliefs, that can relate to Trump followers, needs to ascend to power in the Republican party...and needs to navigate everything back closer to sane, good conservative values.
And I'd say the exact same thing for the Democratic party. Biden/Harris aren't the answer. Find someone that is. A good Governor somewhere. A Senator that has fought for progressive ideals, without completely flipping off people they know don't agree with them.
DeSantis vs Klobuchar??? I don't know. First thought at a Presidential race that would be 100,000,000 times better than Trump V Biden II, or Trump v Harris.