According to your description, what you lack now is not mathematical thinking, but sensitivity to numbers. The sensitivity of numbers requires more dealing with numbers, more contact with mathematical problems and more mathematical thinking to solve problems. This is the breakthrough.

The purpose of dealing with numbers is to explore the mystery of mathematics from the heart and expose my interest in mathematics. I was very interested in pyramid data when I was a child. What do you mean by 365 days a year? How many times is the height from the sun to the earth? Wait a minute.

Money trading, distance, speed, time and many problems in real life can be solved by mathematical thinking. When you get used to thinking like this, you can figure it out yourself without asking others.