I've got a book where I wrote down lists of writing prompts. To make things interesting I'd choose two at random and combine them. I haven't had time for that kind of fun these past few years. I've found another source of prompts, the Bible. I'm approaching it in a similar way though. I've got as far a Chronicles 2. There's this idea that Chronicles was written to emphasise the idea of God's continual presence (I'm not religious) I'm combining that with Blake's idea that God is the imagination, or the mind. So as I read, I'm replacing the idea of God, with the mind, and seeing how that changes my perception of the stories I'm reading. And of course, I'm writing form my own perspective. That's my writing prompt at the moment.
What's fascinating about this work you are doing is the voices you've developed in those poems, David. I'm fascinated by them as a reader. There is a thread-like calmness in them
no matter the subject or how intense the poems images and language are.
Like Tom's epic with Merwin, you have great source material and I plan on living a long time, so keep writing them.