I would love to see Justice and Accountability applying to EVERYONE regardless of political affiliation and for protections to be put in place to prevent anyone from being able to "make things go away" just because they happen to be in power at the time or because you're beholden as a judge to the man/woman who put you in power/appointed you.
Truth, Justice, and Accountability for all, applied the same regardless of your affiliation party or level of affluency.
I would love to extend that also to be able to retroactively punish people that abuse this - for example holding trump accountable for the insurrection/coup he attempted and for quashing all of the investigations into him. Blatant abuse of power and a spit in the face of all the things I previously mentioned. Prison for anyone that helped enable this.
I would also be saying the same thing if it happened on the other side of the aisle. This is a right vs wrong thing, the way it should be.
Also get rid of presidential norms and codify protections to ensure that shit doesn't happen again.
Edit - Also first past the post voting system needs to go and abolish the electoral college. Expand the house of representatives to actually align with the correct numbers to represent the constituents accordingly - it's waaaaaay off today and the balance of power is incredibly skewed.