I don't know how to make them work properly, I've had some strange glitches lately, and anyways it's not a bad read, I'd look up the novel on novelupdates.com, a hyperlink is in the series description
Reading up to where the novel is at right now, trust me it is a slightly standard isekai, but there is a quite intriguing twist of how the kingdom and its barrier were formed so I'd at least check that out when it gets to there (it'll take a bit)
Both are decently reasonable seeing as the Æsir were the main group of Norse gods (Thor, Oden, and more) and elves originate from Norse mythology as semi divine beings living in a realm called álfheimr