My game world crashes, but my blueprints are still here

Hello, I am relatively new to working in UE4. and I am currently running into an issue. When I close out from a project I made after hitting saved all, All of the models and lighting seem to disappear when I reopen it again. However, my Blueprints seem to remain unharmed. Does anyone know what I could do?

You need to open the level you were working on. File → Open Level - select your level. You are opening an empty map it seems. To set which level loads by default when you open the project go to Edit → Project Settings and search for “map” there you can set up which levels open on startup.