American here, though thank god, I haven’t lived there for a long time (still vote every election though). It’s going to be bad either way. If he wins, slippery slope for democracy into authoritarianism and very bad for stabilising the hair trigger global political situation (Russia, Israel/Palestine, etc). If he loses, there will be January the 6th all over again.
Personally, I think Harris will win, but I was shocked before when he won. It was so close. Americans are shockingly uncomfortable with a woman in power, even the progressive ones. It goes against a powerful precedent that rattles people. I think there will also be some surprise voters, who vote for Trump simply because he’s white and a man.
In my own family, my mum, who has been a lifelong Democrat, has switched to the Republican Party only in the past year and is presumably voting for Trump. Harris is, I think, too much change for her, even though she’s likely been de facto running the country with staffers while Biden has been sliding into dementia for the past couple years. I think she feels like with Trump she knows what she gets (crazy), but it’s familiar crazy, white, male.