One can choose a reliable third party application which can perform the task to unlock 7z file with safety. So you can give a try to SysInspire

7Z Unlocker Tool
 

which is designed with the purpose to accomplish this task in simple way. This tool does not require human interference for performance. Choose the file from the local file and restore password with any one of the provided recovery methods such as Brute Force Attack, Mask Attack, and Dictionary Attack. Password in any language with any number of characters can be restored easily. A free demo version is also offered to all with compatibility with all editions of Microsoft Windows OS and 7z/7zip file.

Read More:- https://www.sysinspire.com/7z-password-recovery-software/

eSoftTools developed a tool for all type problems of 7zip file related whose name is eSoftTools 7z password recovery software. This tool is 100% safe and curable for 7z Unlocker as its tested by many antivirus and scanners so without any hesitation use it and recover 7ip password archive file and unlock 7zip file at the same time. A FREE DEMO available for users preview.

Read More:- https://www.esofttools.com/7z-password-recovery.html