As a copy editor, I will revise your manuscript, ensuring it has rhythmical—not repetitive—and correct sentence structure, correct spellings, correct grammatical expressions, appropriate punctuations, etc. This service usually comes after developmental editing, but if you want to focus on this alone, that's fine.
This will require a rapport between the writer and myself, as I will be asking questions about the aim of any unique style of punctuation, spelling or expression. So I'll edit with them in mind. It will also demand the document is in Word, or Google doc, so I can suggest changes to any "peculiarities", and we can resolve them together. This is also no small task, but I am enthusiastic and critical with my work. By the time WE are done, you can expect good results.