Need a normal/unsecured credit card

I have a ICICI Bank Instant Platinum Credit Card (secured card against FD) of 1L limit from past 4 months. I tried many times for a unsecured card but got rejected everytime. I am salaried with 50K+ monthly salary and currently working from home (I think WFH might be the reason for rejection as my office is a startup in another city). And my current Cibil score is 759 which I think is decent enough.
Please tell me how I can get assured a unsecured credit card? I am thinking about card to card basis on my icici fd card. I have a icici bank account where I received my salary and it’s a privilege account (upgrade from normal account) but still there is no pre-approved credit card offer (they have given pre-approved offer for home and motor loans but no credit card). Please someone help me on this situation.