To answer your question in the title - everyone then moves on (hopefully).
Draw a line under it all - both Trump and Biden.
If I was Trump, I'd hold court just now because Biden is a total lunatic as is the Democrat movement.
They'll eat themselves inside-out before long and the other half of America will waken up, then he (Trump) will be vindicated but he could do himself a favour and be dignified in the meantime and accept his proof of rigged elections is either not withstanding scrutiny or accept that he's not presented it (and that's on him).
Then Biden and the democrats need to stop the witch-hunt in return. Stop making a point of reversing every single order Trump made in some childish attempt to eradicate him from American history.
Divisions can't continue.
Biden has no choice but to reverse all of trumps illegal unconstitutional and criminal executive orders.
There will be no locking up of refugees on the border. No Muslim bans. And no border wall. Multi billion dollar boondoggles paid for on a credit card.
Falsifying American history so it’s not to make the country look bad to your children, is over.
The USA is going to run according to democratic values, not authoritarian dictatorship.
Trumps policies have resulted in massive increases in mass shootings, murders, hate crimes, and right wing terrorism.
His economic policies crash the economy. 8 million people have fallen into poverty as a result. 5 million have lost their health insurance. 200,000 businesses have closed.
Why would anyone continue the policies that have led to this?