In order to improve your wisdom, firstly you need to strengthen your brain and the ability to remember and think. That can be done through practices in logic, math, memory, reading, and writing.
Next, you need to learn more about some general knowledge, such as history, arts, pop science, computer, psychology, philosophy, accounting and finance, business, and law. Those knowledge helps to form a solid foundation for your life and further study.
In addition, you can have a weekly reading plan that you can learn more things that is related to your life and work.
Finally, you have to practice and apply what you have learned, which will become part of your life at the end.