Here’s the best way to unify: accountability, justice then reconciliation — in that order
If people can’t unify around the fact that a violent insurrection to overturn the election is wrong, I’m afraid there isn’t much hope. But the fact is that most of the people who think that was justified have been lied to. (A fair number know very well that the election was fair, they just believe they are entitled to win and that the ends justify the means.) Some of those people can move off their position with enough time and a change in the social incentives.
It will be possible to turn down the temperature eventually. But it cannot happen without accountability.