For example, in our retail business, it was to rotate shelves every 3 weeks

Everyone who came in thought we got new inventory every 3 weeks because they saw stuff they couldnt see or didn’t already notice. This led to us getting tons of repeat customers. We rotate the inventory on our e-commerce by deactivating after about 3 months, then reactivating 3 mo later. Variety is the spice of life.

So curious, what is the simplest business strategy that enormously helped your business?