Write another book
Most authors are embarrassed by their first book. I absolutely was. Be that as it may, without that first book, you will never take in the lessons you may some way or another pass up a great opportunity for.
Along these lines, put your work out there, bomb early, and attempt once more. This is the main way you show signs of improvement. You need to rehearse, which implies you need to continue composing.
Each writer began some place, and most of them began by crushing their composition into the breaks of their every day lives. That is the means by which I started, and it might be the place you start, too. The ones who make it are the ones who show up for quite a while. You can do likewise.