Let's polish your prose.
Line edits are where the magic happens. Once you have your plot in place, your character arcs as solid as possible, and an ending that has made your critique partners weep (or not. I'm all for a happy ending), a line edit can take a book from good to great by focusing on smaller, more detailed notes. In my line edits, I take a deep dive into the nuts and bolts of a manuscript, focusing on sentence-level changes, and offering feedback on everything from voice to pacing to dialogue.
There isn't a lot of point in polishing a scene you might end up cutting, so I do not recommend this type of editing if you are still making major changes to your book.