I've tried writing long-form poetry, but it came out to be three stanzas, four lines in each stanza at the most.
Something that might help and be kind of fun: Do character sketches/bios for things that pop in your mind that can further stories. Meaning, come up with everything for each character; height, weight, hair color, hobbies, spouses, boyfriends, girlfriends, children, pets, city of birth, etc.
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"Think of me when you look to the night sky..."-Zorak from SGC2C