If you want to stop the automatic renewal of your premium ad (VIP, BOOSTER, Banner), follow these steps:
Log in to your account.
Go to the ad type settings page within the Premium Advertisement menu (target icon with an arrow in the center).
Select the subscription you want to modify.
Click on the 3 small dots next to the subscription.
Choose the "Automatic renewal OFF" option, or for BOOSTER click "Pause".
After this, your selected premium ad will no longer automatically renew in the next billing cycle. You can turn the automatic extension back on at any time as long as your subscription is active.