Enthusiasm and attention are not enough. As a zero-experience career changer, you should also show that you know something about the job and match your thinking and skills with the job requirements.
We can start with the following two points:
1) means that you have the habit of paying attention to industry trends: only interested people will pay attention to industry trends, so you can talk about the online fund products you have seen recently, or talk about the specific process of your research work.
2) Reflect your own views on the industry and conduct in-depth research: If you are interested, you will certainly have a lot of your own views and know a lot of competing products. Briefly talk about your previous understanding and views on competing products in the market, and I think the interviewer will be interested.