Have I not seen both Harris and Walz in rural areas almost every day lately going into small shops and union factories... putting tons of money and energy into swing states and states not normally considered in play for the Democrats? I don't remember seeing either of them spending much energy going to Manhattan, Los Angeles, San Diego, etc. that I remember. I've heard them both talk about rural areas mostly and being incredibly important and listen to their concerns.
The US is huge, they are two people, it's impossible for them to visit every small town.
Unfortunately, as long as we leave political offices to be filled by the worst of us this will continue. Voting is only half the battle.