If you're still looking for a proofreader, I'm willing to offer my services. I do not have experience as a professional proofreader yet, but I did end up proofreading everything that was written for public view at the museum where I worked before I lost my job to COVID. (This was largely newsletter articles and the text of panels for exhibits.) I am a native English speaker and my BA is in English, as well. I do not have any knowledge of Ren'py at the moment, but as a hobbyist writer I have used Word since...whew, I don't even know since when. Probably around the mid-1990s.
I believe I should be able to proof 10k words in two to three days if there aren't too many errors.
If you would like me to handle this task, you can contact me by email at cbentonwriter (at) gmail.com.