One thing I have learned over the years is that tenacity goes hand-in-hand with creativity. For me creativity is a process (writing, painting, drawing, etc.) and takes time. I do not whip out a painting in one sitting, but might work on it for months. I write, rewrite, and edit before I am satisfied with what I am writing. I tweak, adjust, rework and then finally declare a piece "done."
I suspect that one of my greatest talents is tenacity.
Perhaps you writers might like to make a list of your talents, gifts, abilities, then pick one to write about in more detail. Perhaps you might also like to describe the tenacity you have for completing projects you begin!