Increasing the size of the House and fixing apportionment would certainly help with some things, but we need to eliminate gerrymandering too.

It is bonkers to me that legislative districts are drawn by whatever party is in power once every ten years. Not only should the census be more frequent (real-time/ongoing, really, and more lightweight than the system we have now), but districts should be redrawn yearly, and it should be done by a non-partisan committee.

And we really need an objective, quantitative measure of gerrymandering, and comprehensive law against it.

But really I don't think all of that is it. Making representation more proportionate might make Democrats win the House (and possibly presidency, since electoral college votes are apportioned the same way) more often, but the Senate will still be broken, and political polarization will still rule the day.

We need more than two viable political parties (which would require a major overhaul of each and every state's election process, at the least), and they need to govern through coalition-building, more like how parliamentary systems operate.

And ultimately it's just the tone of the whole thing. Legislators need to stop with this all-or-nothing approach, where the biggest hot-button issues don't see any measure of compromise. But that's a culture thing, and you can't fix that with laws or process.