My first thoughts on Trump:
I don't think commentators are giving Trump enough credit for attracting about 72 million votes. I'd like to see a spreadsheet comparing percentages of eligible voters won over recent history of presidential elections but I'd guess his support is higher than past losers. (Trump is a loser--I love the sentence.)
It's also true his qualities are likely mostly responsible for Biden's record vote total. I think I know most down ballot Republican candidates ran slightly ahead of Trump. If I'd thought about that before Nov. 3 I think I'd have predicted a greater difference.
Why does Trump have this appeal? There's the policy issues, most of which I disagree with, but I think most of the appeal is personal. First, he's a performer. Ann Althouse persists in seeing him as a comic, as joking in many of his statements, statements which I regard as repulsive and evil. I have to admit that many of his supporters enjoy his performance. Second, he connects with the audience. Is that just another way of saying he's a performer? Perhaps. But what I'm getting at is his ability to merge his persona and the audience together in a shared "we/us". He's a demagogue, because much of the merging is based on attacking the "others".
{Added later: Just got an appeal from the Virginia Democratic Party noting that Trump increased the turnout in rural areas, which are critical for maintaining Democratic control of the Virginia legislature.]