Is there someone that can help me correctly apply there at the embassy

I have been dating a lady there in China since last year and it is seriously connection. We talk about marriage and she does not want to come here but wants me to come there. We want to be together and I need to know how to get a visa to go there. I have received the Moderne CV-19 vaccine and willing to take any other vaccinations to travel either here or when I arrive there. My embassy location was in Houston, but transferred to Washington and I cannot reach them. I am reaching out for assistance.