Introduction:
Apple keeps a record of your subscription history, which makes it easy to re-subscribe to a service you previously canceled. You can also change an existing subscription from the same screens.
1- Open Settings on your iPhone or iPad.
2- Tap your Apple ID at the top of the page.
3- Tap Subscriptions.
4- Under the Expired section, tap on the service that you wish to re-subscribe to, or tap an active subscription to change it.
5- Tap the in-app purchase payment method you want to use to purchase the new subscription and authorize with Touch ID or Face ID.