In this regard, you can choose more books, and then send a private letter to each other through Weibo, asking about publishing books at your own expense. Then you can wait for the other person to reply to you next.
If you don't think this method is reliable, you can also see the contact information on the official website of their publishing house. It will be more direct to communicate by phone. Of course, you need to choose more publishers. The famous one is Changjiang Publishing House, which is located in Wuhan. But I think you can find a publishing house in your city, and everything will do.
Because as long as you are a publishing house, you are qualified to publish books, and choosing a publishing house in your city will also help you communicate with editors more timely and conveniently. After all, it also involves the publishing house to review your manuscript, negotiate typesetting, cover setting and factory printing.