You can upgrade your Subscription directly from the Subscriptions page.
If you have a current subscription, you will see a button to upgrade it any higher-tier plans (If available). The price will be prorated based on your current subscription costs and how long you are into that subscription. This is a great solution for users who may hold a single plugin license and want to upgrade to a bundle. Or in the instance that someone may have the Essentials Bundle and want to upgrade to the Full or Lifetime Bundle.