I am not an author, but I have posted a few poems on GA. Motivation? Beats me. It seems to come from strange places. I have written poems about:
1. A Bible passage on love (1st Corinthians 13: 4-13) which my friend Kit also used in one of his stories.
2. An unexpected reminder of a couple I know who split up and then tried to rebuild their relationship.
3. A brief phrase in a medical report which really jumped off the page when I first read it.
Upon reflection, those seem to be an odd combination of things which would provide inspiration for poems. The limericks? They reveal a real hodgepodge of motivators, including current events (a politician's success, a golfer's excess, a big political mess) and a few whimsical bits of philosophy.
There's another poem - my first poem in fact - which remains unpublished after 15 months of effort. It's just not quite right yet. It combines personal experiences reaching back more than forty years with anticipated experiences which lie ahead. It will be published...when the time is right.