You can upgrade your myCloud Light or myCloud Standard subscription at any time. Start out by logging into your myCloud account in your browser. Click on “Change subscription”. Depending on which subscription you’re currently using and whether you have, in addition to a myCloud account, an authorized Swisscom subscription, you’ll have various options available.
If you want to cancel a myCloud Pro subscription, you can do this at the end of each billing period. You can read more about this here.
Please note: should your current storage usage be higher than your storage space available after switching, you might experience limitations when using your account. You can read more about this here.