There is nothing to br done.
We are just all users, like you, here.
What do you expect us to do for you?
You posted before.
This screen issue is NOT a common occurance.
Something happened with your screen. Either from the case you were using or something happened from your own use or negligence.
You did not purchase extended AppleCare+ right away, so that left your new iPad Air 3 vulnerable to any possible user damage for two months!
So, the expensive repair/replacement device cost is now on you!
Sorry that this has happened, but this is the reality and why I always purchase extended AppleCare+ for all of my iOS devices, either at purchase time or as soon as I am enable ( which risks self-damaging my own devices before they have been paid for warranty coverage, as well, just like you did ).
Standard, free, LIMITED, one-year AppleCare only covers product manufacturing defects and not any other type of user damage.
You didn't purchase extended AppleCare+ or decided not to purchase right away.
You gambled and took a chance your new iPad would not get damaged, by you, somehow, within 60 days and your luck ran out!
Unfortunately there is nothing anyone here or Apple can do for you and, unfortunately, this is going to cost you a lot more money to replace, now.
Your iPad Air 3 screen issue is NOT a common defect or flaw.
Sorry & Best of Luck to You!