I started writing a book. I wanted to write fiction books for a long time, but never really got around doing it. I decided to write in English rather than in my own language for many reasons, one of them being that the subjects I write about aren't really popular in my country. Another motive is that I believe English language has become very rich and I really enjoy expressing myself in it.
As the work progressed, it became apparent to me that my level of command of English language will always be below that of a native speaker.
I do not intend to sell my book once completed, but I know it will be a good one. What I want to ask is what are my options in eliminating at least the glaring language mistakes that a native speaker would never make? Where should I look for people to help me with this?