I've thought of separating by subject matter as well, but a side of me is strongly leaning toward just keeping it simple, taking the first hundred days of haiku posts I wrote, presenting them in order, and allowing the patterns to emerge more naturally and organically.

I've always gravitated toward certain themes, so I don't think that it would be so radically "out there" as to defy at least a decent index, but I also think that it might be more interesting, to follow the chronology of what occurred to me when, in light of what was going on at the time.

And I agree, memoir as a genre is currently overused, especially by first-time authors whom no one knows from Adam, which would obviously at this point include me.

Which is why I'm more inclined to start with the haiku, and the essays they inspired, as writing haiku for (initially) thirty days straight did indeed inspire me, and I found that it also honed my thinking and helped me to focus, even when I wound up writing something entirely unrelated to the haiku that I started off with.