I’ve literally tried every single way
There are many ways you can try to recover your project, but we don’t know what you tried but I’ll try to help.
Recovering the project
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Did you update the engine to a new version? If yes, then try to remember what the original version of the engine was the project created with (assuming it is still installed on your system). You can go to your .uproject, right-click > Switch Unreal Engine version…
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Is your project a C++ one? Open your IDE, navigate to your project name, right-click and choose Rebuild – not Build. It will rebuild the entire thing, and not just the changes.
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Do you have plugins installed? Trying to disable them one by one (filter out) which one is causing the issue (beware though if you have code or assets that depends on them). To disable plugins outside of the engine, open your .uproject inside your IDE – not double clicking the uproject. Scroll down to Plugins array and where the plugin says Enabled: true, make it false – remember one by one, then rebuild.
Recovering what you need
I built a structure and that’s all I really want from the project I created
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Create a new empty project, then in File Explorer, copy-paste what you want to the new project folder inside “Content” folder. (example your umap and other dependencies like Blueprints). I don’t know what “structure” means but take that to the new project.
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If the level is corrupted, just copy-paste the "Structure " to the new project.