I think there is no technique. You can use brute for unzip the file

Try this tool 

https://www.lostmypass.com/file-types/zip/ 

https://passper.imyfone.com/zip/how-to-unlock-password-protected-zip-files-without-any-software/ 

https://products.groupdocs.app/unlock/zip 

can you hack insta account?

This hard. In my case I usually use John for opened zip