It is true that eBay listings remain on the site for only 90 days (sometimes a few days longer) after they are ended. Then they are purged, so are not recoverable. If you have any item numbers, you may be able to retrieve a few that are older than 90 days that have not yet been purged, but that is a long shot.
So, yes, you would need to start all over again. 😞
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