Hi Vijay
Here are some additional steps you can try:
https://www.minitool.com/news/cannot-decrypt-fi...
Also see the section of the article at the bottom, how to decrypt a file.
https://winaero.com/blog/decrypt-files-folders-...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.