Speaking of Thor in MCU, I really think that Marvel Studios has wasted the concept of 9 realms as important part of Thor's mythology.
We barely even spend nor know about most of the realms, and now... Asgard got destroyed, and became New Asgard on Earth with no explanation of what fates becoming for the rest of the realms (and also ByFrost is became an afterthought as well).
In Thor: Battle Royale (Ragnarok), as much as I love the movie, but I wish Thor can explore and adventure more in the mystic Norse realms instead spending most of the movie in Sakaar.
Its a shame really since I think the 9 realms in Thor and Norse myth is really fascinating and interesting concept if handled properly. (Jason Aaron's Thor book has showcase of the rich and wonder of many characters and worlds, not just Asgard and Earth).
And God of War PS4 game too, I think has more wonderful depiction and portrayed of the realms of Norse mythology than MCU.
It is truly a wasted opportunity.