You can delete your LEGO® Hill Climb Racing account from the in-game settings by selecting "Account" and following the instructions.
Please note that this is an irreversible action - the game progress and any purchases made on this account will be permanently gone.
If you want to delete all your data, please contact us via the in-game support. If you need assistance finding this option, check our guide on how to contact support through the in-game settings.