"A copy editor reads the entire manuscript while checking for many things: incorrect grammar, spelling, and punctuation; spacing and basic formatting issues; effective writing techniques such as word choice, parallel construction, passive voice over active voice, limited repetitions and clichés, avoiding vague or offensive language; and consistency of spelling and treatment of names, places, objects, actions, etc."
In fact, if you don't prove you have an established platform, with thousands of possible readers, traditional publishers won't even talk to you. No matter how great your proposal is. Oh, yeah, I forgot - before you do or prove any of the above to a traditional publisher, you have to prove you can sell the book and earn back your royalty for the advance. At which time, they will are likely to
In my work, I talk with would-be authors, and new start-ups - generally solopreneurs - who are holding on to the past as if it will keep them from hanging themselves on the future. Somehow they believe past performance is a predictor of future earnings. While it's good to reflect on the past, it's never good to live there. Paul shares his epiphany at around 11 minutes in - the only tense if future tense. It's an arrow in flight and you want to grab it and shake it into what you want it to be.
A copy editor does not squash out your voice. That’s not our job. Our job is to make sure you know the rules so you can choose which ones help comprehension of your book and which ones you want to purposely break.