hdfc credit card

Hey geeks, I have been holding swiggy HDFC credit card for around 2 months now, so can i apply for Core Hdfc card alongside this? Or hdfc doesn't allows this, please answer me with all the possible solutions.

I have a credit limit of 4.5 lacs on regalia gold should I go for upgrade, I had good spends of above 5 lacs in last 6-7 months. Is credit limit above 5 lacs a necessary condition?