Launch the game and open the Menu (Hamburger Icon in the bottom left of screen). Tap the "Settings" option. Tap the "Account Deletion" option. You will be prompted to confirm the deletion request. Once the deletion is confirmed, your account will be permanently deleted this may take up to 48 hours. You may not be able to create a new account for up to 30 days (to prevent cheating).

You will permanently lose access to your account and all associated data, including your in-game progress and purchases! This action cannot be undone.