And about the QR code it has the public and private key there
Okay, but that's still only part of the answer i'm afraid...
- Did you use all 3 methods, or just one?
- In which succession did you use these methods and when did you format your disk?
- when you say the QR code has a public and a private key, but you're talking about bitcoin core, how did you generate this QR code? Did you manually export the private key and address pair and generate the qr code (since, iirc, bitcoin core did not have a functionality to generate qr codes including private keys... but my memory is fuzzy at the best of days, so i could be wrong)
Anyways, my initial advice would still be the same: make sure you don't overwrite any more blocks (since you say you formatted the disk). Bring it to a professional, or (at very least) make a complete clone of your disk before proceeding.
Then, everything depends on the kind of encryption you used... Was it full disk encryption or file based encryption? If file based encryption, you could probably use file recovery tools and try to recover the encrypted files on your formatted disk... Afterwards you'd have to either find information on the encryption scheme by looking at the recovered file, or by brute forcing all methods?