Choose a detail that only your character would notice in this story
(This exercise is borrowed from Donald Maass’s The Emotional Craft of Fiction, a book I highly recommend.)
Think about your character’s past, so that you know what matters to your character, what background they came from.
As an example, I noticed a vase in my in-laws’ house because my parents had the same one. It was really the only notable thing about the vase! It tells you something about our relative backgrounds that our parents chose the same decor…
You might pick something with more emotional resonance: a smell, a song, a flower.
Tell a story about your character that includes a detail that tells us something more about your character.