Frankly if you are pursuing your CA I wonder how you will find the time to freelance and also balance your studies and possibly articleship too. However if you still feel that you can juggle all these, then stick to freelancing related to your accounting field.
-This could include maintaining accounts for some cooperative housing societies, or small enterprises or medium scale units.
- If your communication skills are good you could look at writing/ editing jobs for financial papers or for content creators who get outsourced work.
- If the stock markets interest you attempt to work in the research department of a broking house.
Please ensure that your priority is to clear the CA exams unless ofcourse you have a financial constraint. Ideally you should purse getting some finance related certification like AMFI certification etc.