Learn the basics of how to enter the zone by developing your mental skills
Basketball is a multifaceted sport. To be the best you can be, and increase your basketball skills, you have to develop your physical game as well as mental. Many players did not have a chance to learn the fundamentals of the mental side of basketball due to emphasis on physical talent and physique development. The common thinking among many coaches and players revolves around a belief that a player is born with mental game skills. Some very talented players experience distracted mind, on and off the court, and are not exposed to the tools that help to develop a stellar mental game.
Developing a mental game ultimately leads towards an ability to enter the Zone at will and help the whole team play better. To be clear, developing a strong mental game is an individual process. It does not mean that you need to be in a perfect mood, or consistently have a good day, or experience complete no-thinking and effortless movements all the time. No, it means that you will be ready to perform when it's time to perform with the best of your ability that you have at that time. If you feel tired that day, you will give 100% of what you got. If your mind was distracted, you will still find a way to refocus and be present on the basketball court.
Part of the mental game is your emotional state during the game. You can, and you should, work on your emotional processing off the court as well to be ready for the game time. Mental game includes working on processing of your emotions as well as improving concentration, confidence, ability to perform under pressure, especially when you are not feeling comfortable and things are not going as planned.