Card discounts?

Hello guys 

I am buying poco x6 with exchange but with exchange no bank offer available 

Does any card provide cashback like axis flipkart card but i dont have it

I have idfc first dc & cc

Hdfc millennia dc

Pnb, sbi, au royal, axis prime etc all dc

Hdfc swiggy cc(one friend) 

Can please tell me which card is best for payment or buy gift card… i want effective cashback around 5%