You can cancel an active subscription before the renewal date by turning off auto-renew for Playstation. You can find the renewal date for each subscription in the Subscription Management section of the Account Management menu. The auto-renewal setting turns on every time you sign up for a new ongoing subscription. Auto-renewal is also activated if a cancelled subscription is reactivated. Please note that if you haven't started downloading the main product and your pre-order includes additional content that was available before the main product's release, you will no longer have access to that content if you cancel your pre-order.