How to restore iPad to factory settings

Per your previous identical post…

If you are able to access iPad settings, a full erase and reset is just a few taps away…

Settings > General > Reset or Transfer iPad > Erase All Content & Settings

Otherwise, you can restore the iPad to factory settings - which will fully erase the iPad and install a fresh copy of the most recent version of iOS/iPadOS supported by your iPad:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

To do so, you will require access to a either a Windows PC (with iTunes installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of MacOS). Ensure that your installed version of iTunes has been updated to the most recent version; the essential device drivers are included.

Download and use iTunes for Windows – Apple Support

Update to the latest version of iTunes – Apple Support

To reset the device for setting up again with your data read How to factory reset your iPhone, iPad, or iPod touch

But if you are disposing of the device read What to do before you sell, give away or trade in your iPhone or iPad