What should I do if I am rigid, inflexible and inflexible, and my brain can't turn around? How to change it? Is there any way?

There are methods, but you can't learn them overnight.

The best way is to use your head and think about it. Choose a person around you who knows that flexibility will come, and often wonder why he says and does this, and what effect it will have if it doesn't. After careful consideration, I understand the truth, that is, learning unconsciously. You gradually became that person.