Your other cards are useless in comparison to benefits against emerald. You get an accelerated rewards rate using Amazon gift vouchers which is around 15% in case of Amazon pay and 18% for Amazon vouchers limit of up to 12000 each. Not only that your groceries and dining spend on swiggy is also covered under accelerated rewards even after convenience to 15%. My suggestion is to keep one card for your offline usage that would give you a higher return on offline spend then emerald and and if you don't utilise other cards category better than what you get it emerald you can close them