I can't login to my MacBook Air after restart

"I cannot log in back: I cannot log in after restart"

-------

Troubleshooting a Locked Mac Account:

Some Thoughts:

A. Reset the SMC and NVRAM:

(Applies to Intel-Backed Macs Only)Sometimes changes(i.e. updates) are made to the system and then settings (i.e. for USB Ports/Keyboard) become manipulated, technically.  So, reset both on your Mac.

B. Use An External Keyboard:

It doesn't have to be Apple brand. You might need this adapter: USB-C to USB A Adapter - Apple

C. Reset this Using the Login Screen:

You'd go through your Apple ID to perform this. Find out more here: If you Forgot your Mac Login Password - Apple Support. Make sure that caps lock is not enabled when typing it. No Success? Go here: If you can't Reset your Mac Login Password - Apple Support