Thanks for everyone’s reply. I finally came to a conclusion. If someone is a beginner with no Cibil and wants to improve the Cibil score, then they can have a FD backed Credit Card. In my case, I already have a credit card and I have a good Cibil too, so I am not going to have a FD backed Credit Card. Instead I will use the amount to invest in NCDs or in SGB or maybe even in MFs.
Thanks again for all your valuable replies. Have a great day.