The US has one of the smallest legislative bodies relative to its population size in the entire world. What we need more than anything, is more representation in D.C., not less. And while we're at it, disallowing partisan gerrymandering and making it 100% illegal and criminal should be on the short list of to-do's. A much better option is to make large districts with multiple representatives. Instead of each district getting one, you set up large districts with a minimum of 3. Then you use a preferential voting method to select representatives. In doing this, you can have a representative delegation that more closely matches the makeup of the population in a district. For example, in a Texas district, you might have 3 representatives by population (X population block = 1 delegate) and a population who leans largely conservative. But you still have some liberal voters who would find themselves without representation under a single rep. In making the district large and having multiple reps, you no longer need to draw silly borders to cut out or fence in groups of people. So in our fictional TX district, the people vote and most select the two conservatives in order of preference. One of them receives an overwhelming number, but we use a transferable vote system, which means the 2nd choice of the people is also considered. The excess votes beyond the winning threshold (3 reps = 33% needed to win) go to second choices. So the two conservatives reach 33% of the vote and go to congress, but the third, liberal candidate manages to win 33% of the vote (or second choice votes from the less conservative of the conservative voters) and goes to congress as well. Now you have representatives who more closely match the voters in their area and you can always count on a representative who is friendly to your point of view. You don't get ignored because of party affiliation or single issues.
The lines for districts don't follow boundaries as we see them today. You just draw straight lines on the map to carve up areas. This might divide up voting blocks, but it no longer matters because you still get representation in congress proportional to your population size.You could run a district boundary right through Dallas or Manhattan and it makes no difference.
We are hamstrung by an outdated method of assigning representation and have allowed corruption to run rampant. Strategic voting limits options for candidates to those who will toe party lines; don't push the platform and you get no party funding. I saw an interesting video where someone was asked to define his political ideology in one sentence. The man said 'I believe a gay married couple should be able to defend their marijuana farm with machine guns.' Do you think you'll find support for such a sentence in the wishy-washy milquetoast GOP or DNC these days? If your answer is no, you're hitting on why the US Congress barely represents voters and has an approval rating lower than any president in more than a century. The US population hates congress more than they ever hated Donald Trump or Jimmy Carter. You have to look back to Andrew Johnson to find a president so reviled and consequently, he's why we don't put the runner-up as the VP to the winner anymore.