Hello~!
It is recommended that you first search for information online. First of all, don’t do anything that is more mature and common in China. It is basically meaningless. Secondly, understand what is currently popular and advanced abroad, but what is not yet popular in China. Finally, you must understand feasibility and industriality when choosing. Feasibility refers to whether you can produce it with your strength. If the technical conditions are not met, then don’t choose something too difficult, because this topic must be done. Industriality means that the things produced have promotion value. On the one hand, you can apply for a patent. Or transfer technology to make it valuable. In addition, when you graduate four years later, this is also a good reflection of your future job hunting.
Wish you all the best~@!