Ah. Well, if all official duties of the Executive are immune to all laws lower than the Constitution itself, which itself bars him from very little and gives the Executive responsibility for enforcement of all laws, I guess a Constitutional Amendment is ultimately required then.
It'll definitely take some time, effort and big time coalition building. I doubt this specific one would be as impossible as it might seem though, due to the specifics.
Small govt types could be convinced to support something limiting executive power. That's all the libertarians and some conservatives. In a bloc with liberals and progressives, it could reach 2/3rds support with the populace. Barely. Then 2/3rds the states would have to ratify.
The fact that it would be for limiting the power of govt, is critical though. Fascists don't want small govt and just lie about it, but many people actually do. That becomes a middle position liberals can work with in a case like this, since we support separation of powers.
You're a lot more optimistic than I am. Look at the voting patterns of the right wing of our congress. I don't see any small gov advocates there who pay anything but lip service to the concept. They'll fall over themselves to not only protect Trump, but to be the loudest and most supportive of him.
Well, a lot of them were purged over the past few years. Fascists doing their thing you know. Things change though, that is one certainty. Not very predictably either.
Also note, I didn't exactly say it would be easy. Simply possible. Where, say, an amendment that made voting mandatory would be actually fully impossible.
There's no point in thinking it's possible for it to get better without the entire system collapsing. Authoritarian regeims very rarely end through the democratic process.
It's a battle that's been going for centuries, bigger than any one of us. Taking it personally only has drawbacks, it's not required for motivation. Breathing exercises can help.