How do I fix the game Engine through saves, loss of 1st person, etc.?

So I imported a polygon from Maya into UE4 and the game crashed and couldn’t be saved. A few game window errors popped up saying the mesh and content couldn’t be saved and could only be saved in the editor. Also half of my starter content meshes and things are gone as well as textures. Does anyone have any idea how to fix this?
Here are a few pictures of my issue.

Thanks so much!!!

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