You seem to want to disregard the obvious answer: it’s clear that a President can be removed by one-half of the House and two-thirds of the Senate.
And if you think the House and Senate themselves are complicit, the people themselves can replace each and every House member in no more than two years, along with a third of the Senate. In four years, two-thirds of the Senate may be replaced, plus the President himself is out.
Now, there used to be a law that allowed the appointment of an independent prosecutor, who the President could not fire.
However, when Ken Starr held that role, Democrats did not like the fact that the President could not fire the independent counsel, and the law was permitted to expire without renewal. Remember Ken Starr?
So I’d suggest that the heart of your complaint is: “Other people don’t share my opinion about how important it is to get rid of this president!”