Mowing every three days and my lawn is looking damn thick. Usually looks good until about July or August. Always seems to go downhill after I take a vacation.
ETA:
It took me about 5 years to rehab the lawn after I moved in. Previous owner did nothing. We are on a hill with horrible soil, tons of shade, high acidity. We did some major landscaping last year, had about 1/2 of the yard sodded. The old stuff I have been babying all these years is looking just as good as the sod.
One key thing I did, and I only have the luxury of doing this because I have a small yard, is overseed by spreading tons of Scotts seed starter soil over the top. Once I put the time and money in (lugging countless bags of the stuff), it really made a huge difference.
The next big problem I have to tackle involve 2 poor drainage areas. The water runoff is slowly creating patchiness in some of the sodded areas. Landscaper shoulda buried some drain tiles when yard was all dug up.
Aerating seems to have helped a little but I think I need two trenches or a trench and drywell.
Never ending battle.
(side note, neighbor on one side noticed the yard was looking good this year. This guy does nothing, cuts his lawn with his weed wacker. So he asks for the details on the aerator I used. Good luck with all that. tt would take him years to fix the mess he created and he would end up cutting his new grass with a weed wacker).