A line editor listens for rhythm as well as grammar. Long sentences may need breathing room; short sentences can add emphasis when used intentionally. Repeated openings, vague references and abrupt transitions can make strong ideas harder for readers to follow.
Read a page aloud and notice where you stumble or lose the thread. An editor can suggest precise changes while preserving the patterns that make your writing recognizable. Line editing is most effective after the book’s overall structure has been settled.