Material preview not working

hello. I was working on a shovel, saved it then opened it up a few hours later. it looks normal in solid view, almost invisible in material preview and not right in wireframe. I made sure x ray was off and all other see through options were where they should be. everything was working normal the first time. other blender projects are also like this. how can I get it back to normal? thanks
here are pictures:

bumping the question.