Question on Storage upgrade changes

I am liking the new read-aloud feature. I though about getting an annual 2GB Storage Amount to unlock premium voices for longer times and support Zotero.
However, my library is locally stored (+cloud service) and already bigger than 2GB, so I might decide to move to the 6GB later. What happens if after 2-6months I change my mind and I want to switch from 2GB to 6GB? Do I lose the initial 20$?
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