Can I upgrade my subscription?

You can manage your subscription plan in the settings of your Apple ID, however, according to App Store requirements, it will be changed to a new one only when your current one is up. Therefore, to upgrade your subscription, you need to cancel your current subscription and then purchase a new one.

For more details, please reach out to Apple Support directly, as all the transactions and subscription plans are being processed by them. 

❗Please also make sure to change the plan at least 24h before the end of the current billing period in order to avoid being charged for the renewal of your current plan.