If you wish to restart your career in the game, you will need to use the "Reset Profile" button provided.
The "Reset Profile" button is located under "Settings" (gear icon in the top left area) > "Advanced" in DLS21 (feature available in version 8.03 and above).
There are a few things to be aware of though:
- You will lose all your current progress including coins, gems and other consumables (this includes in-app purchases).
- Profile resets are limited per User (ID) to one reset every 30 days - so once your game profile has been reset, you'll need to wait 30 days before you can reset it again.