You'll still be able to use your Dropbox account that was previously used in the Professional DJ team/Cloud Option DJ team, but your Dropbox account will no longer have 5TB or 1TB storage capacity, and will instead work as a Dropbox Basic account (capacity: up to 2GB).
Previously saved music files won't be deleted even if the total amount exceeds the 2GB limit, but you won't be able to upload any more data.
You can rejoin the Professional DJ team/Cloud Option DJ team with your Dropbox account at any time if you subscribe to the rekordbox Professional plan/Cloud Option.

Find out more details here.