Deleting your account with Universe will not cancel your subscription.
You will need to make sure to cancel your subscription with Apple in the Settings app. Like many other apps, your subscription and billing are handled by Apple to keep your information safe. We do not have the ability to alter your subscription.
If you need to cancel your subscription so that you don't get charged again, you can do so here.
🌟Please ensure you are logged in with the same Apple ID as you used to create your Universe site when viewing your subscription information.