The 'best' thing about iOS is how safe it makes your data. If you lose your data, that becomes the 'worst' thing about iOS.
Government agencies keep trying to crack the encryption & to pwn the device over USB & periodically they manage this, until Apple changes the way it works & locks then out again.
Apps such as iMazing do a great job of being able to look inside the device or examine backups, extracting data from encrypted structures… but they can only do it whilst the encryption keys exist.
Trouble is, once the device is erased, the hardware encryption keys are gone. Pretty much the only thing iOS has to do to wipe your phone is trash those keys. The majority of a recovery is reinstallation.
Once those keys are gone, they're gone. The data is actually all still there at that point, you just have no way to decrypt it. One you complete the restore, of course, you have compounded the issue by overwriting a lot of the old data. Whether it was encrypted or not, that makes the task harder.
No-one yet has managed to unbake this particular cake to get back the flour, eggs & milk.