How to switch a user account to an administrator account?

[prestoniii]

I made a stupid mistake and make the only account on my laptop into a user instead of an administrator and now I can't switch it back. When I try to do so in the settings it would prompt me to log in as an administrator but because my personal account is the only account on the laptop there is no administrator info to log in on. I can't even activate the spare administration account because by default it is deactivated and to activate it I need administration privileges. I tried making another account but the Family and Other Users tab in the settings is not there.What can I do?

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