How to attract customer to our grocery store which is on the verge of bankruptsy?

Find out what your competitors are doing. Visit their store and ask some people why they choose that place to shop. 1 good thing I would do is deliver your sales in Direct mail. You have sales but people don't know about them. Direct mail your area with your current sales and compare them to your competition(people love coupons). Another good idea is Create a facebook page and at every register tell people if you "like" our page I will give you xx off your next purchase or xx. Give people a reason to come back. People will spread the word if you are neat and clean as you say.