HSBC Cashback - 10% upto 1k -> Preferred option
One Card 12-20% - upto 500/month - I'm using this since last 3months (Works on Dmart, reliance, More,etc.)
SCB Manhattan - 5% upto 150 on min, 3k spends
PS - Apart from this every month kotak runs 10% offer upto 750 on Dmart 1st-7th month so this should be good
Bonus - 150 off 1500 Rupay DC offer ongoing in reliance smarts check that too
Get a onecard if you already don't have it pretty easy to get and super offline offers from past 3months. I have shifted all my offline spends grocery, Medicines, offline foods to this cards.