Trump’s mistake was not doing a total housecleaning on day one. After that, his options were limited. I don’t blame him for much of what happened during his presidency after that.
I’m not sure what you wanted him to do about the election unless you think he should have called his supporters to revolt. He did ask them to show up and protest. Maybe after conservatives allowed the left to destroy communities and tear down statues and destroy history the previous summer he doubted that people would actually be willing to sacrifice anything.
BTW, he’s cheering the vaccines he pushed for because they work.
We should have eliminated every Federal department, bureau, agency, and commission and replaced the necessary ones, hiring all new people. Radical, but it might be the only way to drain the swamp.