I honestly don't know how to fix corrupted files, but I would recommend, now that this has happened to you, whether or not you do end up getting it fixed (best of luck to you my friend), to use this as an opportunity to avoid the same issues in the future. If something happened before corruption, make sure you don't do that thing. If you are using any popular game engine, it probably has some sort of version control, so you can go back to files that existed before corruption. If it was code files, most of them have a history, such as VSCode, so you can go back to previous versions of those. I don't know much about corruption, but I do know that everyone hates it and tries to put safeguards in their softwares to prevent it or revert corruption. I hope you do get it fixed, and I'm excited to see what you end up creating at the final submission.
(P.S. 17 days left!!! I have done nothing!!!!)