1。 You can change your major and study economics, finance, engineering, computer, physics, etc. , quite good. With a deep foundation in mathematics, it will be much easier to learn other things.

2。 Applied mathematics is also very promising now, such as some image processing, data analysis and modeling, which some units will use.

3。 If you are interested, then contribute your strength to mathematics! Those who study basic mathematics and engage in pure theoretical research can stay in school.