The name of the game this November is turnout. There are undoubtedly more people who support Harris than Trump, but will they vote? Touching the Israel issue is guaranteed to turn off a large block of voters, no matter which side you support. There's no winning this issue politically.
Either Harris or Trump will be president in 2025, choose which one more closely aligns to your values and policy goals. If you care about Gaza and Palestinians, I don't know how that choice isn't Harris.
There is no "neither" option. One of them WILL be president. Let me save you time and there's never going to be a candidate but you agree with on every issue.
If you want to make a fundamental change in the electoral process, the middle of a general election isn't the time. You literally cannot change the process at this point.