Without a backup, all you can do is install the software again and start over.
You should never rely on your hosting provider to create backups for you. They are more concerned about backing up your server and not your site. So while they could do a full restore of the server itself, they can't just restore your site. You need to make periodic backups of your data to keep it safe.
Wish the answer was different but not really much more anyone can do.
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