Ironically the fix for this is quite simple. Use score voting instead of first past the post.
Score voting is simple: It's the voting system the judges use in the Olympics. Voters give each candidate a score. Highest average (i.e. the one who would get the gold) gets the seat.
The flaw in first past the post is that it gives any viable third party the powerful incentive to merge with the major party they're most similar to, because otherwise they split the vote and both lose. So you get a two party system. Score voting doesn't have that, you don't have to change any other part of the system to make it work, and then the two party system everybody hates goes away.
Proportional system may work better, because it will guarantee that a political party will be represented by its best candidates and it is not affected by gerrymandering. I do not see though how one of them could happen in USA.
One of the best things about score voting is that it eliminates primaries. Each party just runs all of their candidates in the general election, and then the voters decide who is the best one.
PR puts the party instead of the voters in control of who gets the seats or otherwise requires the voters to support a party when they want to support a specific candidate.
Score voting also thwarts gerrymandering because you can't make two 55% districts for your party and one 90% district for the other party or the districts for "your" party would go to a moderate party instead.
Score voting is simple: It's the voting system the judges use in the Olympics. Voters give each candidate a score. Highest average (i.e. the one who would get the gold) gets the seat.
The flaw in first past the post is that it gives any viable third party the powerful incentive to merge with the major party they're most similar to, because otherwise they split the vote and both lose. So you get a two party system. Score voting doesn't have that, you don't have to change any other part of the system to make it work, and then the two party system everybody hates goes away.