It's hard for me to understand why he would come back to Earth. I get that he has a loving family; a big, nice house; a childhood friend; modern, advanced tools, like a smartphone or TV; modern food and all those things, but in another world he has so much more.
He has the fame of a hero; people who love him like a family; multiple beautiful women who like him; some good, male friends; magical powers(since he didn't know he would still have them after coming back); the lifestyle of a royalty; an opportunity to advance technologically a medieval level world by hundreds of years and go down in history not only as a hero, but also as a great reformator and inventor; a whole different world to explore with sights that won't appear on the non-magical Earth and so on.
He has the fame of a hero; people who love him like a family; multiple beautiful women who like him; some good, male friends; magical powers(since he didn't know he would still have them after coming back); the lifestyle of a royalty; an opportunity to advance technologically a medieval level world by hundreds of years and go down in history not only as a hero, but also as a great reformator and inventor; a whole different world to explore with sights that won't appear on the non-magical Earth and so on.