First of all, you can choose a lot of extracurricular reading. Pay attention not to novels, but to a large number of social science books.
If you don't know what to read, you can go to the bookstore to read the best-selling column and choose what you are interested in, such as weird psychology and concentration. Read in your spare time, and then draw a mind map of the whole book.
Then, you might as well ask a question in reading and come up with a solution by using the book itself or connecting it with real life.
Then, you tell others what you think. If you can make others understand your thoughts, it means that your own thinking mode has been improved.
Finally, observe the people with excellent thinking ability around you and take them as examples to learn. Actively communicate with them more ways to improve their thinking ability.
I believe everyone can improve their thinking ability in the end!