“Item Not Received” A to Z

I’m getting so many A to Z claims for items not received and its really hurting. It’s to the point where I’m about to cross the threshold and Amazon is just giving away my money.
When I asked amazon how to make sure these claims go in our favor they said that we need to buy postage through our account, I normally buy postage through shipworks. I just got 2 claims in the customers favor that had UPS postage bought through amazon, so that option was not true. I also used to use delivery confirmation with USPS but if the customer isn’t home to sign they would open a claim and since it wasn’t delivered it would go in their favor.
What are you guys doing to prevent or even get these claims to fall in your favor?

Thank You