Americans just weren’t convinced that Harris would do anything to improve their economic situation.
Why would they? She never proposed anything specific AFAIK except like 1 week before the election after early voting was already over. If she hadn’t avoided taking any policy positions except unconditional aid to israel, lower proposed tax rates for the rich than even Biden was proposing, continued fracking, no improvements to healthcare, and more lethal military/border while avoiding talking about abortion for months, maybe people would have reason for some hope for improvement.
How many Americans know about proposals about things like tax credits for parents or plan to expand medical care coverage under medicare (or was it medicaid?) to at-home care except the small percent who follow that kind of news.
Stop giving bombs for genocide and stop telling people that the economy is already great so they should not ask for more and instead give popular policy positions that help people more than a week before the election/after early voting.