Democrats need to lose this election. There has to be an electoral consequence for openly supporting an active genocide. No, this doesn't mean supporting Trump -- his genocidal rhetoric should get the lowest amount of support possible.
I'm probably going to vote for some non-genocidal presidential candidate with no chance at winning, then vote for Democratic congresspeople. If enough people do this the message will be "the votes are here, but not if you're going to do all the things you say we should be terrified of Trump doing anyway." Democrats holding at least one house of Congress will also (minimally) impede Republicans and prevent idiot lib pundits from writing "maybe everybody just wants fascism?" articles.
Hopefully this will open space for a significantly more left candidate in 2028, the way Hillary eating shit in 2016 opened space for Bernie to be the plurality favorite in 2020. Between that and libs finally taking the bad stuff Biden is doing seriously once Trump is in office, maybe we'll shift a few things in a slightly better direction.
And that's just the electoral piece. Beyond that, working on genuine harm reduction projects, trying to unionize your workplace, joining political organizations left of the Democratic Party, and trying to persuade people that Democrats are a dead end are all good things to do.
This isn't a complete plan for getting to bare minimum improvements on issues like climate change, healthcare, imperialism, etc. (and note how that standard is never applied to Democrats), but my thinking is it can open up avenues to those improvements that aren't currently available.