There's nothing you can do, at least outside of your local community. It's still possible to be a decent human being and help people with your own two hands.
At this point the only thing that would have stopped this would have been Joe Biden radically shifting to the left and laser-focusing on lifting the poor and middle class, to the extent that their new quality of life would make it unthinkable to vote Trump.
Instead, the opposite is true. Biden's spent the bulk of his time making arms deals and funding other countries' wars, and homelessness jumped 12% in 2023. Hell, in a year half of the US will have literally criminalized abortion in all cases, because Idaho got away with it already.
Fascism isn't some looming specter. It's here.