There is a saying that knowledge is power; the ability to be creative and do other massive things. Big things are done by the aggregation of small ones, a bit of this (knowledge ) and a bit of that is how newness enters the world. You can learn from anybody and come up with something new that nobody else knows about before. You can learn from four great people and not just become as great as four of them put concurrently but greater than they put concurrently.
"Try to learn something about everything and everything about something" Thomas Huxley. Get knowledge as much as you can because the knowledge you have is what will help you in creating. Because you are a writer does not mean you should not learn about cookery. The knowledge you get from another field can make you creative in your field.