You can't. Vote for whoever you want, but we'll never stop bombing children. I'm not voting for any pro genocide candidates, but I don't really care if you do as long as you don't pretend that's not exactly what you're doing.
You vote for the least bad option, and start doing the grueling grassroots work to make the options less bad
Eliminate the electoral college
Ranked choice voting
Eliminate the senate or make it propprtional to population
Expand the number of house seats
Expand the supreme court
Public funding for elections
Media that is not advertising driven
Unions!
Coop employee owned companies
Do these and start building something that doesnt suck
America is ruled on Israel first politics. Media is Zionist. Politicians who just mention "ceasefire is good" got record primary funding against them, even if those that lost never made Israel an issue against them. The rest of American oligarchy influencing politics sides with Israel instead of fighting with them, because usually Israel doesn't take much of the budget. Israel becomes the kingmaker. Trump is favoured by Netanyahu maximalists, but all politicians take a loyalty oath to Israel/AIPAC.
Ranked choice voting
This is your only recommendation that gives alternate parties a chance. It would need a campaign focus that Israel first rule/money of the Republicrats disqualifies them. Media would need to be nationalized, other "lobbyists for evil" would also need threats to be nationalized. UBI/Freedom dividends is more important than democracy, because it redistributes power to the people instead of hoping for a hero to fix everything.
We can't escape genocide because we can't escape money in politics.
So you do the exact same thing over and over and over again because both sides will tell you the other is the worst that would happen, when in fact both would continue supporting bombing babies.
The presidential primary is probably the wrong place to start, unfortunately. Because of its scope, it's hugely expensive in terms of both money and power to get a successful candidacy there. In order for there to be a Bernie on the debate stage 2016 and 2020, you need a couple dozen progressives in the House, a few progressive Senators, a handful of progressive governors, and a metric boatload of progressive state and municipal legislators. For international affairs, the dominant force there is going to be the House Reps and Senators because the other offices won't have much leverage on that issue. It's hard to campaign on an issue that splits the big tent and triggers foreign spending against your campaign. The fact that there has been no inkling of an indication that Congress would have the prospective candidate's back makes it basically nonviable at the national level, as much as that stings. Airing a campaign message of "we will cease a betting thenIsraeli government in their war crimes" beside lower level candidates going out with messaging of "we need to strengthen our relations with our allies in the Middle East" is a disaster waiting to happen, and that is a message that won many a House Rep Democratic primary. It's an unbearably slow process to drum up a response to a system that is murdering children by the day, and the only solace is that every success makes the next win easier. But it is the system we have, and the only way to change/reform that system short of violence is through a series of small, hard-fought victories. It's how liberals/progressives were able to get the extent of LGBT rights that we do have, it's how direct military intervention and corporate bailouts are becoming, if not fully frowned upon, a policy that carries some shame and embarrassment for its advocate. It's also how abortion rights have been eroded by the regressives, and it's how transphobic policies are becoming a nationwide phenomenon
"Using the language of fascist genocide perpetrators is not the way to go."
then don't do that.
"Also…who the fuck can afford to “live outside the US most of the year?”
if you can afford to live inside the US at all, you can afford to live outside of the United States as long as you want at a much higher quality of life.
you don't even have to get angry about it for no reason.