You can do lots of market research and do focus groups and figure out what people really want, or you can just kind of go for it and make the book you want and hope other people like it.
你可以做大量的市场调研 以及目标客户群 去看看人们到底想要什么 或者你可以试着推出 你想要的书，再看看人们是不是喜欢