One of the many reasons the fantasy genre is so popular is because people can escape to new, magical worlds and live in the author's creativity. It's new, exhilarating, and sparks a sense of adventure in people. This is why the isekai trope is particularly popular. It allows readers to see what it would be like to be reincarnated into another world filled with magic, elves, monsters, or even magical beasts.
Source：https://www.cbr.com/isekai-manga-protagonists-reincarnated-as-nobles/
