After the 48h grace period, if the subscription has expired and is no longer available in your cockpit, you have to manually renew the subscription.
You can do that by going to the Cart Icon in the top menu -> My Subscription Plan.
Select your expired subscription and click on the renew button.
If you are still in the 48h grace period, the plan is shown as expired in the cockpit.
If you have paid with a Credit Card, the system will try automatically to charge your card every 4 hours.
If you have paid with PayPal, the system will not try again to charge; you have to wait until the end of the 48h grace period to renew the plan, or you can directly subscribe to a fresh new pack.