I am a fiction writer primarily. Although I love reading nonfiction, that is not my gift. I love to write what I call adventure romance novels.
So if offered the chance and money, I would pull one of the stories I have going on in my head and put it to paper, and love every minute of it.
Just start writing on something and the work will pretty much take you where it needs to go. Write write write and the ideas will narrow down until you feel a passion for one story or subject.