Simple. You punish zionists and democrats for backing genocide. If they keep losing on their positions then they’ll learn to work for your vote. That’s why always voting red or blue no matter what is bad. It just makes your vote worthless because you’ll vote for them no matter what.
The real question is how do you end up in a situation with two terrible candidates that will be happy to commit genocide with no consequences. It’s a mutlistep issue.