USPS could do a few things to improve and they really aren't that big. For the following examples consider this: I live on a "no outlet" road. Meaning 100% of traffic is for the 20 houses on the street and not through traffic. And of the local traffic it is extremely minimal, we have more kids playing on the street than we have cars.

1) Stop being lazy. For example, I ordered something from Amazon and even though I have Prime, I paid for next day delivery. It was something I really needed. I rushed home that day excited to finish a project. Looking out the window I watched the USPS guy drive right past my house. A short while later I got a notice from Amazon that my package wasn't delivered due to an obstruction blocking my mailbox. I go out to the mailbox and look around trying to figure out what the obstruction was. The only thing I could figure out that would be possibly considered an obstruction was the trash cans I had just taken out that were about 5 feet to the left of the mailbox.

2) Consider somethings could possibly be fragile and take that into account when handling. For example, earlier this week I had 2 "large" flat envelopes delivered that were clearly way too large for my mailbox. Instead of considering that the contents may be fragile the USPS guy just jammed the envelopes into the mailbox the best he could making them into a crumpled mess.