And like. I’d consider myself a far left liberal, in the sense of how the U.S. defined liberal when I learned the terms, where it was more a place on the political spectrum, rather than a codified set of ideas.

The funny thing is, the US defined liberal is the codified set of ideas, liberalism is just to the left of the median in America. America is that far-right.

Right to left, I’d define the that spectrum as Reactionary (Alt-right), conservative, centrist, liberal, and revolutionary (leftist, I think?). I know that those terms have different meanings in other countries.

The problem is that you jump straight from Liberal to Revolutionary, there's a spectrum of thought among leftists. Revolution may be correct, but there are schools of reformist thought as well. Additionally, liberals and all those to the right of them are Reactionary, just in varying degrees. A "centrist" would be left of liberalism, ie a Social Democrat or Market Socialist.

I’d consider the Republican Party to currently be between conservative and alt-right, with the Democratic Party being centrist with liberal window dressing.

The Democrats are Neoliberal, there's no set dressing. Liberalism is just right-wing. Conservatives are far-right populists, ie fascists in some cases.

I think the U.S. political system is fucked. It was never intended to accommodate political parties, let alone the nearly 250 years of maneuvering by capitalists to slip reigns onto the government, which now appears to have fully succeeded.

On the contrary, the US was designed by wealthy Capitalists to benefit themselves. The system is working as intended, protecting Capitalists.

I believe that the embrace of fascism by the Republican Party is a means to control the ~60% of people who are left of center and without cohesive political representation because of limitations of the U.S. political system/bastardization of it/the pernicious influence of capitalism.

Fascism is a class-colaborative alliance between the bourgeoisie and petite bourgeoisie against the proletariat and lumpenproletariat along nationalist lines to attempt to forcibly return to a less-decayed state of Capitalism.

I don’t support the Democratic Party, nor do I really feel the U.S. government is in a place to fix itself without some foundational things changing. I don’t think, realistically, that those things can be changed without mass engagement and effort, which… sigh. I’m doing what I can.

Correct. Join an org!

But also, I don’t believe a revolt or some form of dramatic U.S. government reformation is possible. As a result, the folks that are already demanding change and have given up hope for reforming the system are hostile to me, and the other folks fall into the camp of being disengaged/only mildly upset or even desirous of a slide into fascism. It feels like there isn’t really enough people who are unified who want to change course without throwing the whole thing out.
I honestly feel kind of alone.

Reform cannot work, Revolution is the only way. Build up dual power, organize, and try to build up parallel structures. Organize!

What happens if the U.S. does elect Trump and it swings full fascism?

Beating Trump won't stop the conditions for fascism, only Leftism can. Fascism can only be kicked down the road, until the ratchet effect takes us there anyways, unless Leftists organize.

I’m not trying to challenge or debate anyone here. I don’t think you’re stupid, nor do I think the ideals are bad. I fucking wish society was more altruistic and smarter.
I just… don’t see any realistic or actionable outcome other than to keep fighting for every inch using the tools we have, even if they are faulty, entrenched systems.
Call me propagandized, unimaginative, cynical or stupid, or… whatever, I guess. I just don’t see other viable options, and I think broadcasting moral superiority, embracing divisiveness and exhibiting hostility is going to create roadblocks, should we need to unite. If we can.

You've got the core of it, but not the theory. Try reading Leftist theory! Whether it be Marxist or Anarchist, leftists have been attempting to fix the system and are growing in power.