You know what would to be really, REALLY uncomfortable?
If Harris loses, there's a strong chance that it might be over this terrible war. What a stupid, stupid reason to have to live through another Trump presidency.
Cut your nose to spite your face then. You'll keep paying for genocide even if you won't "vote for it."
The things you can do are support groups and politicians that will push the country in the direction you want it to move. Really think about what action (or inaction) does for the things that matter to you. You have an opportunity to do something to help reduce overall suffering and make the country and world a slightly better place.