Looks like you have some smoothing group problems on some meshes (armchair, phone, couch…). You should increase the polys and add more details on the meshes.
Also, check if all your materials are PBR frriendly. I think at this stage, you won’t pass the requested Epic quality.
Thank you for the advice I use sketchup and blender to model can you give me some advice about smoothing ? I am also making a game called nothings left check it out
Just google it : smoothing group in blender