its an mmo, not a single player game. only way to start over is to make another account but i'd watch the rules as some mmo's (a lot actually, or so i'd imagine) might ban you for multi'ing.
I played helmet heroes a long time ago, but I stopped , and for a long time, the account reset for no reason and I am happy with it because I wanted to change my class because being a wizard means you need to upgrade four attributes mana, health, armor, and magic.