The level of amateur band 4 has been well established. What is lacking is thinking and experience in fighting. I suggest you read more professional players' chess manuals (see what kind of players you like, you can buy such chess manuals), and learn from them the skills, ideas and hand muscles used by experts from the layout to the end of the game. Over time, practice makes perfect. When you encounter similar chess types and situations, you can play a wonderful game. Secondly, play chess with high-level players. Only theoretical knowledge is not enough. Only through actual combat can we truly understand the chess theory we have learned, and only through actual combat can we further consolidate and strengthen the theoretical knowledge we have learned.

Of course, if time permits, we need to accumulate and improve the basic knowledge of Go, such as layout, middle game, ending, life and death, especially the latest chess ideas and concepts.

In fact, the best way is to recognize an amateur or professional chess player as a teacher, who can turn the tables for you and get twice the result with half the effort.