I Am a Wizard in the Tribe

In an accident, the modern young man Geralt fell into an ancient tribe and transformed into a legendary wizard! The primitive continent is full of dangers, ferocious beasts appear, and battles between gods and demons... Entering the divine realm, defeating the Titans, only to find out that it was all Zeus's conspiracy? Can Geralt save the day, unify the tribe, and conquer the primitive world? This is my first time writing a novel, so please bear with me.