There is a Constitutional amendment out there awaiting ratification that would guarantee one representative for every so many people.
It would require expanding the House to more than 5000 members based on current US population if I remember correctly.
It's the only part of the US Bill of Rights that has (so far) never made it into law.
https://en.wikipedia.org/wiki/Congressional_Apportionment_Amendment
I actually like the idea of ratifying it.
It would certainly require some changes to be made. You're never going to fit that many people into the House chamber.
But members could be allowed to vote electronically (maybe even remotely from their home district). And it would make an individual congressman both less powerful and closer to his or her constituents.