Do neurosurgery. I used to be a neurosurgeon, and later I went to graduate school in orthopedics. I have experienced both, so I have a say, hehe.

If you have the initiative outside the great god, it will be easy to produce results, and it is also possible to learn something. The threshold of orthopedics is low, and major surgery has become less mysterious, let alone research. If you are in a big hospital, there will be a lot of income, such as cerebrovascular intervention surgery, and an operation will cost tens of thousands of dollars of equipment. If you are in a small hospital, you can do orthopedics. Because small hospitals are mostly trauma-oriented, it is difficult to produce results, which is not as practical as orthopedics.

I hope this helps.