Please read this link to learn how to view your subscriptions that renew automatically, change your subscription period, and turn off Automatic Renewal. --> See or cancel your subscriptions - https://support.apple.com/HT202039
Is auto-renewal already off? Does it say it will renew on a certain date or does it only say the subscription will end then? If you are not seeing an option to cancel then it probably means the automatic renewal has already been turned off and the current subscription is simply waiting to expire.