After update my Mac is not making it through password screen

Change or reset the password of a macOS user account...

https://support.apple.com/en-us/HT202860 

How to change the admin password on a Mac…

https://www.macworld.co.uk/how-to/mac-software/change-admin-password-mac-3535328/

Look in Sys Prefs Users & Groups &make sure it says admin under your name, a few have had it changed to standard on an UpGrade.

You forgot your Mac's password. Here's how to get back into your locked-down computer

https://www.cnet.com/how-to/you-forgot-your-macs-password-heres-how-to-get-back-into-your-locked-down-computer/#:~:text=With%20your%20Mac%20turned%20off,up%20below%20the%20Apple%20logo.