Instead of always trying to dominate him (which he could percieve as you being a dictator) try to bond with him. If he is a loner like you said, that could be a good indication to you that it might be difficult to prove to him that you ARE interesting, fun, provocative, and a place of safety and comfort. Horses that are loners really don't give a rat's behind about humans, generally speaking. Why would they want to bond and communicate with a PREDATOR if they don't even bond with their own kind?
So, I would focus on BONDING instead of dominating. PROVE TO HIM that you are not boring and that you ARE worth communicating to. Do fun things with him, go for walks on-line in different places, set up puzzles for him to solve, but above all don't be CRITICAL. Horses hate that, just like we do.