Yes, of course!
If you signed up on our website:
Go to wondery.com/plus-members and sign in if necessary
Select "My Account" from the top half of the page
Select "Manage Subscription" from the lower right area of the page
On the next page, select "Change Plan"
If you signed up via our mobile app:
iPhone or other iOS Devices: On your iOS device, open this link https://apps.apple.com/account/subscriptions
Android Device: On your phone, go to Google Play --> Hamburger Menu (in the upper-left corner of the app --> Subscriptions
Note that when you upgrade, you will be charged the Annual price immediately and your subscription will be extended for one year past the end of your current subscription term.