I just finished working on my model and now shadows or related to ray trace are not working, they are enabled but I think maybe some kind file issue, please help me to sort out.

Below is my render outputs while I was modeling and when I completed modeling.
Tried many possible ways of exporting through obj or fbx to my previous save but after importing them in new scenes shadows still not working.
I also reseted maya and render settings.
And also it showing black output in maya software.