There's a solution I like: ratify the original First Amendment, which would have greatly reduced the number of constituents per representative, which would a) have made representatives more responsive to their constituents, and b) made it harder for wealthy special-interest groups to capture every election for the House of Representatives. It was originally understood as correcting an inaccurate wording in the Constitution.
Here's the text:
> After the first enumeration required by the first article of the Constitution, there shall be one Representative for every thirty thousand, until the number shall amount to one hundred, after which the proportion shall be so regulated by Congress, that there shall be not less than one hundred Representatives, nor less than one Representative for every forty thousand persons, until the number of Representatives shall amount to two hundred; after which the proportion shall be so regulated by Congress, that there shall not be less than two hundred Representatives, nor more than one Representative for every fifty thousand persons.
For reference, right now each representative is supposed somehow to act on behalf of almost two thirds of a million people! How can one person vote on behalf of so many, who are inevitably drawn from a mix of rural, urban, poor, wealthy, and every other varied circumstance of life? How much can any one person feel represented, or hope to influence who represents them or how?