This won’t happen but one idea for the incoming Democrats to upend US politics but do so in a way that would be very very hard for conservatives to argue against.
Repeal the “permanent apportionment act” and set the number for representatives far lower than the 800k+ people it is today (even higher in states like CA).
This would add a massive number of new representatives and make each more accountable (and shift the electoral college) all by going back to the original constitution