Kinda disappointing, not only is it a worse "getting tired of the lazy high elf life" "inspired" work, but then it goes into the most cookie cutter, overused trope of hero v demon lord, and ofc the hero is some shota who's been being used for and sneered at prob. Sheesh, like at least try being a bit more original, even a smidge.
It would've been way more interesting if he would be like a third force and he would explore both sides' reasons and situations while they're fighting or like anything else that would actually make his background being a high elf matter, now it feels like it doesn't matter that he's a high elf at all, he could do the same shit as human as well knowing the reincarnation trope.
Just so tired of this human v demon setting, it's literally been used to death for decades now, it has no impact on the readers whatsoever.