Why is there a genderbend aspect to the story? It barely adds anything to the story other than being a cover for his real identity as the OP legendary battle mage, but it didn't need to be a genderbend for that.
It's a weird take on the retired op hero / rebirth / power fantasy tropes but the challenges Raniel faces have nothing to do with his new gender but rather a new identity because no one knows who he is. It's unexplored and lazy, if you change it from genderbend to a vanilla rebirth/isekai then it doesn't change the story at all.
Raniel seems completely asexual as well, may as well be a Goku expy. This is like Ranma 1/2 but the story just avoids mentioning anything about the genderbend or anything remotely lewd, it's extremely jarring. A retired hero power fantasy rebirth genderbend series, but it somehow keeps it extremely classy (other than Raniel having a ridiculously huge chest).