There are two relatively straightforward things you can do that will help the situation: (a) vote, and (b) campaign to move to get some form of proportional rep

There are two relatively straightforward things you can do that will help the situation: (a) vote, and (b) campaign to move to get some form of proportional representation become the voting system in your state, both for statewide and national elections. A major reason why you've entrenched interests is that they have safe seats they can depend on. The US has major issues with acts of gerrymandering that create those safe seats. Most forms of PR are much more resistant to gerrymandering than FPTP is. And if you want people who'll do something regarding healthcare costs, you need to get rid of those safe seats and make them accountable.