Players have the ability to optionally reset their progression and start their character from scratch. Please note that this will not remove any Account Items.
If you want to start your adventure all over again, you can do so by launching the game and opening the Options Menu from the Main Menu, in the Gameplay tab you will see a Reset Character button. After pressing that, you will be prompted to confirm you want to proceed with the reset, once you confirm, your character will be irrecoverably wiped. Note, if you're already in-game you may need to relog for this.