Let's be fair.
President Biden will be between a rock and a hard place.
One way for him to "unite" the nation is to have the family jewels to refuse to prosecute former President Trump for any alleged criminal or even civil offenses.
Candidate Biden has already said that he would NOT stop any such prosecutions, but-- of course -- he can change his mind if he so wishes.
If he were to change his mind, however, the outrage from the leftists would be deafening.
So I do not think that he could stand up to Vice President Harris & his woke Cabinet on this issue. After all, many Dems have been literally salivating at the thought of seeing the former President doing the perp walk.
So I would guess that President Biden cannot unify this nation, which will only become more and more divided in the coming decades, until it implodes by the end of this century.