It’s a lot of work to rewrite. But you, as the author, are the only one who can do it. No one else can do this work without losing your voice; no one else can see the story that you have in your head and translate it to the page.
I’m not talking about editing here (we’ll get to that.) Rewriting is much deeper. You’re not polishing; you’re tearing down and rebuilding. If your story were a house, you’d be tearing down the garage and adding a new bedroom, not just painting the siding.
Congratulations! You’ve finished your novel. Maybe you managed to do it all during National Novel Writing Month. Maybe it’s been the labor of several decades.
Regardless, you’ve finished.