I know it has zero chance of happeninf unless democrats get total control, but I wonder/hope if the party can work on
abolishing the hard cap of congressional districts set almost 90 years ago by setting the size of the house to be more in line with the population, and forcing all districts to have a reasonable similar population within a state, you could have a house closer to the will of the voters. If you make it in line with the representation given at the time of the hard-limits passing, the house would have about 1400 members total. This would also be a way to get the electoral college more in line with the popular vote, as it would be more granular (every state would get more votes, but it'd be weighted to the states with more people).
I could see resistance from house members in the sense that their individual voice would be diminished, but it would be a boon to the Democratic Party by lessening the issue of their voters being clustered in cities. Rural voters in smaller states would still get a larger say, but the degree wouldn't be nearly as bad as it is now.