If you are a student, focus on your studies. Once you get a job, banks will voluntarily offer you credit cards.
Also stop saying you are depressed for these immaterial things.
You are lucky that you are a student holding a credit card and the reason of the decline of your card is Student so instead of focusing on Credit cards, Focus on your Career once you get a decent job or a start business and be an entrepreneur. Banks will run back like crazy on you! So don't get depressed you should feel great that you have cibil of 750 and credit cards trust me I got my first Credit card at the age of 23 Post Graduation. This is all materialistic not necessity and you can get it later on..
And why is that you are getting rejected? Are you able to meet the income criteria? Salary or ITR?
If not then there you go.
Others have given you a path forward. Study >> Get a Job >> Get CC.
For quick gratification:
You may try the C2C method to apply for other credit cards. But remember, at the end you'll have to pay bills of these CCs.
So choose wisely.