I have to add something important. Address lines should be bigger. But in addition to that, you forgot to think of the other end of the experience. Whereas previously it was optimized (if at all) only for the postal worker, currently it is optimized only for the postal customer. If someone has a stack of 20 of these to rip through, segmentation would help for very particular and important bits of information. This form should be balanced between both the customer and the postal worker / machines that handle the work and the sorters and delivery men who frankly must deal with more than one of these cards in any given day.
It’s great to make it good for the consumers but think of the ones as well who do not see these only in a blue moon but deal with them daily.