The most successful grocery store in my state, Virginia, was called Ukrops. Kroger carries their stuff, but idk if it’s on a national scale. Anyways, they were successful because of their customer service. I personally know dozens of people that would get their groceries rung up, my mom would spend $500 at a time, only to discover that either they had left their checkbook at home or they were out of checks. Every person said that the cashier, who wouldn’t even have to call over a manager mind you, would tell them to take their groceries home and come back when they got a chance and pay.