After quitting CA You can go with CFA (Chartered Financial Analyst) which is one of the career options for CA dropouts (who left for some reasons). By completing CFA you can find opportunities in Equity Research, Research Analysis, Investment Banking, Portfolio Management, Auditing, etc.
It is a certified course that will give you a career opportunity globally and earn a handsome amount of money. But CA would have limited you only to India.
To become a CFA you have to clear three levels of the exam. You also need to have four years of practical work experience. You can register for the CFA after graduation or if you are in the final year of graduation.
CFA is overall more expensive as compared to CA and other domestic courses. Even the examination fee is far more than the registration fee of CA.