Unfortunately, if any part of your private key is lost, there is no way of restoring it. Besides you have made an offline copy where everything is written. You can also try to guess, but you do not need to be smart to realise that the chances are almost zero.
I am constantly convinced that it is because of their fault that cryptocurrency users lose their money, and not because of the imperfection of the technology. Already a million times each of us speaks about all sorts of risks and how to protect ourselves, but mistakes still continue to be made.