Found my misplace iPad. it have erase iPad. How to not erase it?

If your iPad has already been erased, after the iPad has been setup again with your AppleID, you will need to restore your data from a pre-existing iCloud or iTunes backup:

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

See >>> Mark a device as lost in Find My on iPad - Apple Support

“Turn off Lost Mode for an iPhone, iPad, iPod touch, Apple Watch, AirPods, or iPhone Leather Wallet

When you find your lost device, you can turn off Lost Mode.

1. In Find My, tap Devices at the bottom-left side of the screen, then tap the name of the device.
2. Tap Pending or Activated under Mark As Lost, tap Turn Off Mark As Lost, then tap Turn Off.

For iPhone, iPad, iPod touch, or Apple Watch, you can also turn off Lost Mode by entering your passcode on the device. For iPhone Leather Wallet, you can turn off Lost Mode by attaching the wallet to your iPhone.”