Only when the entire Collections feature has been completed can 'Prestige Mode' be activated.
To enter the Prestige Mode, click on the “Collections” tile on your lobby screen.
Then click on the “Continue” at the left of your screen, just below the Enter Prestige Mode option.
Once you click the “Continue” button, it will show you a pop-up with the terms of the Prestige Mode. If you wish to continue, kindly tap on the “OK” button, and you’re all set! If you don’t want to continue, tap on the “Cancel” button.
Once you click “OK” it will reset your previous progress and allow you to start over the Card Collection process again.
Please note that once you select to enter the Prestige Mode, you can’t undo it.