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.
2 is campaign finance reform. The only meaningful campaign finance reform is going to come with limits on political speech. Otherwise you just get the same amount of spend with even more of it being funneled through PACs.