You can try some of the tips given here: Change or reset the password of a macOS user account - Apple Support
Apple Event: May 7th at 7 am PT
I forgot my log in password and try to reset it with my Apple ID. But it keeps saying there was a server error. How can I get logged into my computer?
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You can try some of the tips given here: Change or reset the password of a macOS user account - Apple Support
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Can’t sign into my MacBook air