Resetting your password would most definitely help you access Apple Mac OS High Sierra without knowing your password. There are two ways to do it.
Option 1: Use Your Apple ID.
Option 2. Use the Reset Password assistant.
While accessing Apple macOS High Sierra without a password is easy, there are times when desperate times call for desperate measures. If you really need to get to your files now, you can turn to FoneDog iOS Data Recovery. Download, install and launch it on another computer.Simply select one from the Recover from iTunes Backup File or Recover from iCloud Backup File options, addictions, you can also Recover from iOS Device if your iPhone devices are good. The program can scan the backups and then recover lost or deleted files and other data for you. You can then choose the files that you need and download them within minutes.
Completed guide: Easy Ways to Access Apple Mac OS High Sierra without a Password 
Debini
And here is the method to unlock phone without password: https://www.eelphone.com/password/how-to-unlock-phone-without-password.html
You may also try the iphone data recovery here to get back you lost files: https://www.smart-iphone-recovery.com/