On a societal level, your guess is good as mine. Perhaps increased infrastructure spending so that high-skill, high-pay jobs are more evenly spread out and ideological segregation is reduced?
On an individual level, being active in (non-political) hobbies and volunteer groups can help, especially ones that attract both people from the cities and the countryside.
For large majorities of voters, dropping that ballot in the box is over 90% an identity game.