I accidentally disconnected my mac from find my iphone. how do i undo this process and recover my files?

As per the article Add your Mac to Find My - Apple Support

When you turn on Find My Mac, the ability to locate, lock, or erase it is turned on automatically. Depending on the model of your Mac, Activation Lock is also turned on automatically to prevent anyone else from activating and using your Mac, even if it’s completely erased.

As per the article Erase a device in Find My iPhone on iCloud.com - Apple Support

If you erase but then find your device, you can restore the information on it with an existing backup. See the Apple Support articles Restore your iPhone, iPad, or iPod touch from a backup, Restore your Mac from a backup,

Have you done back previously on Mac , say archived them Archive or make copies of the information you store in iCloud - Apple Support

How to back up your iPhone, iPad, and iPod touch - Apple Support

See if anything here helps.

Find My iPhone Set Up