High Priest Sylvain:
You need the appropriate level and token to become a Human Wizard. To change profession, your level must be at least 20, and to become a Wizard, you must have the token that proves you have passed the Test of the Human Wizard.
You have achieved a sufficient level, but it seems you have not yet passed the Test of the Human Wizard. You will be accepted as a true Wizard only when you have passed the test. Parina, who studies elemental magic at the temple in the village of Gludin, can tell you about the test in detail. You must attain the Bead of Four Seasons, which she will give you when you have collected the tokens for all four elements.