Just read this page, so possibly this may have been covered in one of the earlier pages.
Trump's obvious, and very important, if unintended, contribution has been to show up, finger-in-eye, can-no-longer-be-ignored, those glaring inefficiencies and loopholes crying out to be set right. Any lesser a montstrosity than Trump, and they might not have stood out so. Any more or smarter than Trump, and they may have broken the nation for good. As it is, it was a great wake-up-call, to set these administrative issues right.
Yes, political fissures too, obviously, but here I'm speaking of the administrative stuff, easily enough fixed (compared to the far more difficult political stuff).
Like, 1. After the election, and up till the next administration takes over, drastically limit all executive powers. Barring emergencies, preferably do away with all overreaching powers of the lame-duck, caretaker President.
2. Bring down the huge gap between vote and the next administration taking over.
3. Remove the Pardon thing. Or at least, require all pardons to necessarily be backed by a two-thirds mahority. (Either no pardons, or there's a vote in the House, once a year, for all pardon candidates, and the Prez can pardon only those that get the two-thirds majority support. Or something along those lines.)
Those three, off the top of my head. I'm sure there are others. Fires to put out there always will be, but the Biden administration should not let go the opportunity created by Trump's sheer grotesquery to push through some of these long-needed reforms. The horror that was Trump will then have served a useful purpose, if this is done.