As for the problem of employment saturation, there are so many people in China that no industry is saturated, but there are always people who can find good jobs. It depends on your own strength. Don't worry.
If you become a maritime lawyer after graduation, the main reason is that the road is too narrow, and the future and money are very uncertain. Girls do have a disadvantage. There are too few convenient law firms and they are monopolized. Small cases are not worth tossing about, and big cases are too big for newcomers. Even if you have money, it is only possible to work in this business for a long time.
A bachelor's degree is enough to enter a shipping enterprise. If you are committed to being a maritime lawyer, it is necessary to study abroad for postgraduate entrance examination. Of course, if you are good at English, you can pass the undergraduate exam. However, the working environment of maritime lawyers is similar to that of other lawyers, or directly speaking, the judicial environment in China is very poor now, the competition between law firms is as fierce as that in the vegetable market, and the relationship between lawyers and judges is worse than that between vendors in the vegetable market and urban management. But then again, all walks of life are similar.
Finally, anyway, English is very important.