I forgot my password to my IPAD not is says unavailable

See this for instructions to get out of your dilemma. You will need to erase your iPad using a PC or a Mac with iTunes installed or a Mac via the Finder if it is running Catalina or later.

If you forgot your iPad passcode - Apple Support

If you are running iOS 15.2 or later, see this.

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support (CA)