How to remove myself as administrator from MacBook Air 2022?

Someone needs to have an administrator account on your Mac. If there is someone else, they can just log into their account, go to the user settings, and remove the option to allow your user account to adminster the computer. If you're the only user of your Mac, then you cannot remove yourself as an administrator and you would not want to since that would cripple things.

Regards.

If you cannot follow the steps here:

If you forgot your Mac login password - Apple Support

...then your only other option is to contact Apple for assistance. They will require you to have proof of purchase (a receipt for the Mac showing the serial number.

Sorry, but it was confusing when you posted a second time without saying that you were now asking about a different issue. Yes, it's related to your reason for asking, but is not related from a technical standpoint, hence my puzzlement. In any case, I hope the Apple Support article is able to help you solve that second problem.

Regards.

That's a completely different situation than what you first asked about. Look here for Apple's steps:

If you forgot your Mac login password - Apple Support