English-Chinese translation is also very easy to write, writing about advertising language and trademark translation are good. You can also write a translation of the business direction.
Linguistics is not recommended, unless you know it well, it will be very difficult to write and there are many proper nouns. Forget it if you haven't learned it.
Generally speaking, it will be more exciting to choose a topic that interests you first, and then look up the information and make an outline.