There is nothing we users can do for you concerning this issue.
I am sorry to learn that you are experiencing touch screen issues with your fairly recent 2019 iPad Air 3 model.
I believe that your 2019 iPad Air 3 may have contracted a serious, hardware and/or software related, intermittent, unresponsive touch screen issue/problem/bug/flaw.
See this Apple support link for some additional help, if needed.
If the screen isn’t working on your iPhone or iPad - Apple Support
Per the directions/instructions found in the link above, I STRONGLY suggest/advise you call contact Apple support on this intermittent, unresponsive touch screen issue.
This is a well known issue here in these iPad support communities.
This intermittent, unresponsive touch screen issue affects a continuing, growing minority of iPad Pro users/models across all 4 years of iPad Pro models, as well as the new 2019 10.5 inch screen iPad Air 3, which is based from the 2017, 10.5 inch screen iPad Pro models.
The best you can do is to continue to alert Apple to this growing issue and hammer the Apple iPad feedback pages mutiple times on this issue.
The only way to get Apple to, DIRECTLY, listen to you is to use their feedback portion of their website.
iPad Feedback
http://www.apple.com/feedback/ipad.html
Cognizant Apple employees read ALL feedback generated from all of the various feedback pages and transfers the data to the proper and responsible Apple teams and personnel , but NO Apple employees will ever respond with any type of direct, individual replies from the feedback you post.
You can post as much multiple feedback about this issue any time.
The more users that post product feedback about any product issue, the faster Apple is made aware and starts working on a fix/solution for a future software update.
Sorry that your iPad Air 3 has contracted this issue.
You are now part of small, but still very much a growing minority of larger screen iPad users that have been affected by this intermittent, unresponsive larger iPad touch screen problem/bug/flaw.
Sorry & Best of Luck to You!