If there’s a book you really want to read, but it hasn’t been written yet, then you must write it.
Of course, the word "book" could be substituted with "poem" or "story" or "play."
I think virtually every writer comes to writing because they love experiencing (typically by reading) what author writers have produced before them. And I also think that most writers will write at their best when they are writing something which they feel a connection with in some way.
Are you feeling stuck? Think about what you would love to read but haven't found yet and try writing that.