It's a situation that sucks. Yes. The US is on the verge of falling apart. Paths of least resistance are towards either civil war or an autocratic state that will try to preserve popular loyalty by targeting marginalized groups. Fascists doing genocide.

Regarding your question How long will you keep fascism at bay like this? the answer is as long as we have to.

It's not a hopeless cause. The Republican party is crumbling from within, is bleeding money and loyalists. The MAGA coalition is so focused on doing what Trump wants that it's ignoring down-ballot elections. Then there are numerous efforts to interfere with or obstruct Republican efforts to pass hateful laws, even while we can't really depend on the courts since so many benches have been filled with MAGA loyalists. But the failure of the courts to be either impartial or fair, favoring tough on crime justice over rehabilitation is an old one. But the Democratic party might just be able to outlast the Republican party, which will end with a second premature coup d'etat.

One of the advantages we have is the ubiquity of phone cameras and internet, which means the public gets to see more of what happens on the ground. This is impacting the situation in Palestine as well, as news is no longer controlled by a couple of agencies, but has plenty of independent leaks. I'm sure this informs the movements of the White House towards curbing Netanyahu and the IDF, supplying Gaza and moving towards a Palestinian state and an international coalition team to enforce terms. When gross images of atrocity go viral, whether that's IDF prisoners being mistreated, or people getting gunned down by US law enforcement, it is a really bad look when officials ignore or dismiss such incidents.

That said, all the myths that allowed for two far-right political parties in the US to control state and federal governments have been debunked while their plutocratic overlords (campaign financial contributors) still are pushing for a neo-feudal state, and the recinding of civil rights. It mirrors the situation during the Great Depression, for which FDR's New Deal was a stopgap and industrialists and Hoover were looking at Mussolini and Italy in admiration and envy. (All that got interrupted by WWII and the cold war).

So I can say with confidence I have no idea what will happen next, but doing anything to give the US to the Republicans or to incite civil war would make shit a lot worse for the common American, with very little chance we'd get any public-serving progress out of the outcome for a century or two.

So the first step is recognizing the degree to which the US has been destabilized and how much civil rights have been stripped from the public, despite what kids are being taught in public schools.