Trying to unlock ipad
How to factory reset iPad without iCloud or password
iPad (6th gen) WiFi, Cellular
this is how you factory reset it Restore your iPhone, iPad, or iPod to factory settings - Apple Support
mind you it will not remove an actication lock
the activation lock is not really on the ipad it's a theft protection measure on apples servers
it needs to be removed
How to remove Activation Lock - Apple Support
if you don't know your appleID
if that does not help you then you need the assistance of apple
Additional Support - Activation Lock (apple.com)
and or
And or
Genius Bar Reservation and Apple Support Options - Apple