When I looked back, my most used card is HDFC Tata Neu Infinity itself. Almost spending around 70k-80k per month on that. Another one is ICICI Amazon Pay - a very no-nonsense card. Mainly for Amazon purchases, flight and hotel bookings.
Next is HDFC Swiggy but now a days, swiggy spends are very less. So this is resting in wallet.
Maximize, Amazon. I buy multiple of 5K or 10K. Use it for Insurance, recharge/bills. Recently for car service too I paid via cashfree link using APay instead of direct card.
My top three....
1. Infinia - almost everything, everywhere - online and offline.
2. Octane - obviously fuel; plus, grocery, movies (offers), and then some.
3. Amex Plat Travel - Income Tax (after TDS), and sundry things. 🙂