1 is something I've been saying for a while. One rep for every 35k residents was the count at one point, right? I hear it's something like one for every 800k now. And constituency shouldn't be based on geography; if the most important issue to me is whatever, I should be able to fill my ranked-choice ballot with candidates that support Whatever. We can work out the mechanics, but the point would be to have a legislative body where each rep had 35k distinct names behind them.
2 is dicey and I would like to try campaign finance reform first.
I don't want to throw everything out because that's how you get slavery and The Handmaid's Tale. At the same time, I'll gladly acknowledge that a lot of our institutions were rotten from the founding and to their core, and their dismantling maybe not necessary but certainly suitable for a reborn America that leaves much of its baggage behind.