If your subscription has been cancelled and you would like to renew it, check the following on how to do so.
If you bought the subscription via iTunes under an Apple ID, unfortunately it is not possible to resubscribe. You will need to wait until your account changes back to free to buy a new subscription.
From the web
- Tap this link, which will open in your default web browser and Log in to your account.
- On Your Dashboard, press Resubscribe. Toggle between the monthly and yearly options and pick Premium or Premium Plus subscription and then tap Resubscribe.
That's it; you have restarted your premium subscription.