Rewrite 20-Page Academic Paper

I have a 20-page academic manuscript that needs a thorough language overhaul. The ideas and structure are already in place; what I need now is a polished version that reads smoothly and is free of grammatical, punctuation, and syntax errors... (Budget: $250 - $750 USD, Jobs: Academic Writing, Article Rewriting, Article Writing, Editing, Ghostwriting, Google Docs, Microsoft Word, Proofreading)