How to reinstall macOS on MacBook with admin?

Hi, you can restart your Mac and press the COMMAND+R keys when it powers up(long click), and it will send you to recovery mode. In recovery mode, you can find a section called "Reinstall macOS Monterey".

For more steps to reinstall the software system, follow: How to reinstall macOS - Apple Support

You may not have deleted the recovery section of the drive as it's seperate to Macintosh HD for this reason. Follow what Ocillus recommend. If you have removed the recovery section, you will need a second Mac and USB stick or USB hard drive to make a bootable MacOS installer.

Apple has a guide here: How to create a bootable installer for macOS – Apple Support (AU)

Did not the referring article work for you? As Ocillus says, that's Apple's definitive guide.

What didn't work? What error messages did you get?