We feel very sorry that you want to leave us.
If you've paid using PayPal, you can cancel the subscription in your PayPal account: https://www.paypal.com/us/smarthelp/article/how-do-i-cancel-a-billing-agreement,-automatic-recurring-payment-or-subscription-on-paypal-faq2254
If you paid by your bank card, please contact our support team via email firstname.lastname@example.org and provide 4 last digits of the card and e-mail connected to the license.
You would help tremendously if you let us know the reason for cancellation. We strive to provide superb products to our customers, so any feedback is much appreciated!