Another thought I’ve had for a long time: why not just lift the limit on Congress? My understanding is that Congress set a law to cap it (as opposed to the constitution specifying it) Which made sense 100 or even 50 years ago when members of Congress needed to be physically present to vote in DC.
But today in a world of the internet, video conferencing, etc. it seems like that limitation is arbitrary. Much smaller districts would exists. Making gerrymandering harder. Making a the house look a lot different than the senate. It would make the House more like … a mayor who writes and votes on laws in DC instead of locally.