Responses
Mc is relying on past experience and the current body was enhanced to fit MC's dream of becoming stronger by the magician, the reason of mc becoming a girl is probably the magician trolling him.
Also the manga shows that mc is in the stage of "merging" with his current age, body and mind as his personality changed and he said "As I thought I'm still not used to this body."
dissapointing af as fuck so he got into a girl body then just become strong??? thats it no training no hardshipp and all??