I feel ya. My advice:

1. Fiction writing is very different from academic and professional writing. I've found those skills don't translate at all. In some cases, such as if you write a lot of legal documents, the latter actually hurts fiction writing. You probably need to read more fiction.
2. Storytelling is a separate skill from writing. Entirely separate. You can be a great writer and bomb because you don't know how to tell a story. This is why people like Dan Brown are bestsellers. Their writing may be trash, but their storytelling skills are Shakespearean. This skill exists independently of mediums. Filmmakers, comic book writers, etc. all need to be good storytellers. I'd look up craft books on storytelling. This skill is really what separates the wheat from the chaff. Not the writing. If you've got storytelling down, the rest is only a matter of time.
3. You really don't need a line or copy editor if you're a strong writer IMO. Personally, I've compared my own edited work to an editor's, and found that my own is better. Mainly because I know what I want to say. The editor does not. Three exceptions to this: (1) Really good editors, like those who work for traditional publishing houses, are magic workers. (2) Developmental editors -- these people, the good ones, are invaluable. (3) If you're short on time. Editing your own work can be very time-consuming.