Ancient prose: If your level of ancient prose is acceptable, it is of great benefit to read more ancient prose. Read more ancient prose, and you won't be afraid. You will feel that this is a kind of enjoyment. Needless to say, the four books and five classics are especially recommended. However, there are many similar stories. Pick a few famous ones and have a look. Han Yu's ancient prose is a classic among the eight masters. It's good to read Mr. Changli's anthology.
Foreign literature: I don't know if you have read the book "Golden Rose", which is very profound and warm.
Theory of TCM health preservation: Mr. Wu Qingzhong's Manual for Human Body Use is very good personally. After reading it, I will pay close attention to my health problems. I studied it carefully. Unlike Zhang Wuben and others, the problem I talked about is very real.
I haven't read many other modern novels, so I can't recommend them to you, especially all kinds of fantasy and truth-fixing. I have been confused and have never been interested. However, a guy in our dormitory read the notes of grave robbery and thought it was the best novel he had ever read. This guy doesn't usually praise books easily. I think there should be something to read. Interested parties may wish to have a look.
Besides, I want to give you a suggestion. Next time you ask a question, you'd better limit the scope, so it doesn't matter what you recommend. Enjoy your reading.