Well, I see his approval rating barely changed the last 3 years by the link you posted. It was 43.4% on March 2017 and it's 44% now. It means a huge chunk of the American public likes what he has been doing the last years, or at least can't find a better candidate.

I'm afraid it's wishful thinking to think most Americans are sick of Trump. Some are, for sure, but the data you posted isn't showing anything significant happened.

He will likely win again from what I'm seeing.