They need understanding of how to improve their interactions. Jane doesn’t understand, for example, that she speaks more loudly sometimes, which causes Joe to feel yelled at. Joe, otoh, doesn’t understand that getting Jane’s attention by waving a hand works better than by calling to her.
I think too that neither understands things like Jane not always being able to hear herself, causing some difficulty in speaking clearly, and that Jane is less able to hear some frequencies than others.
I recall hearing that when people were going blind, someone would train them in how to be blind, like how to arrange their clothes so as not to dress in purple and yellow socks, iyswim, and how to use a cane.
I thought there might be someone similar for hard-of-hearing people, who could come over and see what the problems are and offer strategies to smooth things out.