It is the best and most enjoyable stage of writing for me. Don’t assume that revision is unpleasant or a chore. Some writers dislike it but for others it’s the most satisfying part of the work. I find generative work (creating new material out of nothing) excruciating; it comes very slowly for me and with a great deal of pain. I much prefer the revision stage, where I get to see the work improve as a direct result of my efforts, see the story shape up and start to do some of what I set out to do with it.Thank you for the encouraging words - I am committing to seeing this rejection as a positive! Can you be more specific about the ripening? I hope that you are not suggesting that going back to edit again is the loveliest stage of writing a novel
On topic, I agree that this seems like an encouraging rejection, and also that I wouldn’t rush in to hiring a professional developmental editor. You probably have quite a lot that you can still learn about craft on your own, from resources like AW, from reading other authors’ published works critically, from reading books on craft, from beta readers, etc. Learning to write novels is a process, and a long one. Working on learning the skills to make the book as good as you possibly can on your own, before you decide to pay someone to tell you what to do.