"Dear Author of my book..." --Write a letter as if you are a character writing to your author.
You can use a real book character if you want, or make one up, or write as you. Poetry, prose, anything you like.
Dear Jane Austen,
teens falling in love with literature idealize me and then they grow up and find out I'm a pretentious little shit. But at least you also gave them Wickham, so thank you, I guess.