Since you already mentioned this issue in your other recent topic, this one seems to be obsolete now. Here’s my post with suggestions for reference.
Though I can still add that you can consider connecting your project to version control and also having backups of your project in a safe drive to be safe in the future to avoid losing progress. Don’t get me wrong, I’m not saying that your project is corrupted or anything. It’s just an important thing to have if you don’t already. That way we can start over the process of converting your blueprint project into a C++ one if you manually adjust the project files and cause irreversible changes. 