Congratulations! This is really great confirmation that when you are doing something you love you get presents from the Universe
I don't remember who wrote this, but I like the quote: "If you want to learn a subject, write a book on it". The thing about writing is that you don't just put your ideas on paper, you research the sphere, meet new people, find new information, get thousands of new ideas. Writing a book is a great thing to not only teach your readers something, but to learn yourself as well, and that is exactly what you want as I understand