I will always recommend you to use software like extract password protected 7z then you can take the help of this  Enstella 7z Password Recovery Software., where you can extract password protected 7z safely and easily, using this software you can easily unprotect your password of 7z file. You can recover password with 3 password recovery methods, 3 best methods are Brute Force Attack, Mask Attack and Dictionary Attack.

INFO;-Extract password protected 7z