Maybe you are closet romance reader yet you write spy novels. Maybe you wanted to be a professional jockey when you were little but were scared of horses. What would people be surprised to hear about you?
It can be something funny like a most embarrassing moment you’ve never told anyone or few people know about. It can be something awesome and cool like meeting someone famous or creating something that was bought by a company and is sold all over the world. It can be something tragic and sad that others might be able to relate to.
Maybe you are like me and are highly introverted. Talk about the challenges and how you overcome them for everyone online to think you are the opposite.
What would people be surprised to know? What would they assume incorrectly about you? Blow their socks off and get them even more interested in you and your work.
If you really can’t think of anything about yourself, think of your characters. They all have secrets and usually juicy ones at that. You’re the writer. Hint at something in their past. You might think of something good to add in a sequel. Everyone loves this kind of thing.