I have been looking at a lot of articles about how to become a bestselling author. One of the tips was to read a lot of books, poems, essays, and other forms of writing. At the time, I decided that this would be a great way to become a bestselling author because writing would come very natural.
However, this also applies to your expertise. There is no limit to how much of an expert an individual can become at their niche. If you read the books about your expertise, listen to speeches done by the experts of your niche, look at the marketing tactics, and do a lot of other things, you will be able to nourish your expertise.
By nourishing your expertise, your will obtain a giant mass of knowledge you never had. A little bit of extra knowledge can be helpful. When you get a lot of bits of knowledge, you can do something extraordinary that has a dramatic impact on your niche.