I think he'll wholly jettison the Republican establishment this go around. His VP is going to be a sycophant, as will anyone else in his orbit. He's going to go on tour holding rallies every other week, talking about toilet flushing water and how they clean coal. He'll piss the Pentagon off by ending Ukraine involvement, and/or saying the quiet part outloud with regards to Palestine - something to the effect of it's ok for Israel to eradicate Palestine because white colonialists erased the natives in America and that worked out well for everyone since now there are Indian Casinos.
What else?
It would 100% be worse. Biden's second term also would be worse.