You could use the opportunity to showcase again ALL benefits included in the subscription that has just been purchased.
A purchase is typically motivated by a specific feature included in the subscription (e.g. offline content, HD, ...). The subscriber might not be aware of ALL features included in the newly-acquired subscription, which may reduce his.her appreciation of its value over time. The more a subscriber taps into the full range of benefits included in its subscription, the less likely he.she is to churn.