How to decrypt .domn files ?

Hi 
I have tried all things which are given here – 
https://www.myantispyware.com/2019/09/16/domn-file-extension-remove-virus-restore-domn-files-without-decryption/
but not able to recover my actual file.
My all file converted into .domn file.
So, how to recover / restore the files.
please help.
thank you in advance…!!!