This is a very important question!1?

O.K. i really need some help. i did History day and got 3rd, so I am not going to state, but i want to get ready for next year. The theme is Innovations in History. I need people/topics. My dad said that the reason why I didn't make it to state is because I did a Ballerina and the judges hadn't heard of her and didn't get the concept. Please help!