Thor: Ragnarok is a good and smart film, but if I could change one thing about it it would be this:
It would end with Thor giving up his kingship entirely, since the whole Asgardian system of monarchy has pretty much proved itself to be built on bones, and suggesting the Midgard system instead.
Heimdall becomes the new, elected, Asgardian ruler. (Valkyrie plans to run in the next four years.)