Or you elect a more competent president with almost as bad policies who is then worshiped as a herald of a new age for American politics since Trump has pretty much dug the bar under the ground.
Don't even need to do that. Just impeach Trump or get him to resign, and then you get Pence, who is a) more competent and b) has policies just as bad.
Which is another problem with impeaching Trump, because Pence will look so much better by comparison that everyone will forget that policy-wise he's every bit as bad as Trump and hence all those horrific positions will be normalized, even lauded.