All he needs is his base?

yeah you go with that. The election is over, kid. Time for Trump to govern. He's not doing too well
That is an illusion. Other presidents got into office and sought out minor new changes and things which were just variations on a theme, like turning a boat 5°. So of course they got it done easier, smoother and with more apparent success. Trump is in there trying to make wholesale changes! Huge changes to everything from how our government operates, the jobs market and infrastructure to re-positioning ourselves and renegotiating everything on the world market, along with battle with HUGE international problems.
SO OF COURSE it appears things are not going smoothly, as well, or that he is doing a worse job. If he succeeds at even one of these things, it would be a greater accomplishment than all of what most presidents do in an entire term! What is sad is how many who are more than eager and quick to see him fail.