The truth is, not too many people nowadays appreciate poetry at the level that people did even a few generations ago. A cultural paradigm shift has rendered poetry books to be somewhat of a niche product instead of a mainstream one. That is why it is extremely difficult to get major publishing houses to even consider Publishing Poetry Book manuscripts that you came up with, unless you are already established. Online publishing and other forms of self publishing are viable options, but going to a small publisher that specializes in poetry might be your best bet.