Once you finish your first manuscript don’t stop there. Why stop there? Why stop when there is so much more to tell, more to say? So, don’t stop. Keep creating something new and becoming better at this art form that you have chosen to be a part of, to practice in.
And keep in mind, even the pro writers are novices in their own right. Even they are still learning and improving. The only way to get better is to keep pumping out all the awful stuff because the good always comes after the bad. I have written a total of 10 books, but only half are any good and worth bringing to the editing stage. I am working on pumping out more, but finding an idea that strikes me enough to keep me from giving up on it is difficult. It took me months before I found my next great idea, but when I did it took hold fast and I wrote 6 pages in 2 hours. I was unable to stop writing until my hands were too sore to continue.