The materials are still well prepared. As a result, the visa officer didn't ask to see the materials when answering the questions, so I didn't hand them in. I don't know how to reapply immediately.

You can explain to the visa officer when you reapply that you have relatives but are not familiar with them, and that you are not visiting relatives in the United States this time. Only in this way can you help the visa officer to judge whether you have a strong economic and social binding force on China. Good luck.