For a beautiful lawn like you see in home and garden magazines, topdress annually with 1 inch (2 cm) of compost. It will work its way into the soil and enrich and decompact it. Take the opportunity to fill in any depressions with a little more compost so the surface is equal all over. Then, overseed with a top-quality low maintenance blend of grass seed (one containing endophytes). There are beneficial fungi living inside the grass seed that make the grass that sprouts unpalatable to leaf-eating insects.
You can topdress and overseed in the spring, but results are even better when you do it early in the fall.
With soil enriched and aerated by compost and grass thickened by the arrival of healthy new arrivals—and by repeating this restoration annually—your lawn will never have looked so beautiful!