If I wanted to publish a book of poems, I would / could do it. It would involve putting effort into that, on a regular basis, and not giving up. The reason I have not done this is that I have not put effort into it consistently enough, and the reason for this is that I have given priority to academic projects. It doesn't have much to do with not being a good poet, because actually I am, or of not writing poems, which I do. I'm assuming that most poets are bad anyway, and that most books of poems are crap, so that this is not the issue at all. In other words, even if I were among the crappiest poets alive, that should not be an obstacle. When I have tried, I have not been successful, but that is because I tried to do it rather than actually doing it. We only use the verb try when we make insufficient effort.
The book of poems assumes different shapes at different times in my life, and there may be more than one book that I could publish.
The significant thing here is to take responsibility for the fact that I haven't published. If I directed attention in that direction, it would happen.