@08riss I moved your post to this thread since you have a similar question: Will I lose my collection after canceling Premium?
No - you won't have to start all over again.
When you cancel your Premium subscription, you will not be able to access your on-demand music collection or custom playlists.
However, your collection and playback history will be stored in our servers for when you resubscribe to Pandora Premium directly through Pandora. In the meantime, you will have access to all the stations you've created and any podcasts you've added to your account including all Thumb feedback and added variety.
Hope this helps explain!
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