MacBook restore data after Apple Configurator reinstall

At this point, if your data is important to you, your best bet would be to send it to a data recovery specialist. Even then, this is might be extremely difficult for many reasons, but the one I suspect is in play here is File Vault.

It is likely, in my experience, that your drive was encrypted with FileVault. On top of removing all your data, the firmware restore also deletes your encryption keys. Drill Disk might not see data because it's seeing encrypted data with no way to unlock it.