Local data cleared cards gone

Recently i have switched my chromebook from developer mode back into the default mode and in doing so, have cleared all local data meaning i cant get into my old account with all of my gcse flashcard content for the year, do you have any known census or storage portal where this data is stored and would i be able to retrieve this, thanks for your help. It could be under this email or another email, thanks for your time.

If you were syncing with ankiweb.net, you may be able to log in there to get access to your cards.