Hierarch Asterios:
A change of profession occurs when someone with the required abilities and experience is promoted to a more advanced profession. I'm afraid you cannot change your profession here. However, I can give you some information. An Elven Mystic like yourself can change profession to become an Elven Wizard, who practices elemental magic, or an Elven Oracle, who studies divine power. Which profession do you wish to know about?
Elven Wizard
Elven Oracle