I suggest using eSoftTools 7z Password Recovery Software. You can use it to recover your 7z file's password. It comes with some very useful features for users too. It offers three recovery options: Brute Force Attack, Mask Attack, and Dictionary Attack, and it works with any Windows version. It can save the password to the clipboard for future use and can recover multilingual 7z file passwords from all types of 7z and 7zip files.

Read more:- Recover the 7z password