Sadly the only way to recover your server is using backups, if you don't have, then your server is gone. Sorry
Thats very sad but thank you for quick replies! 
Posts by suzkrajber1234
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Read: Data retention of server data
So i cant get it back at all?
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Okay so we created a server during quarantine and we played on it, then we stopped when we started playing some other games, then we started again in maybe june but stopped then also bcs some of our friends couldnt play and when school started we had to stop, we wanted to play again few days ago but when we came back it was deleted. Can we somehow get it back? (we didnt turn on backups) and the username from the server creator on aternos page for creating was JelenaMarkovic or Jelena Markovic im not sure, but help ASAP!