Sharpen the mower blade if not done yet, this makes for a clean cut. Control weeds as they appear. A thin lawn is more prone to weeds. Dandelions, henbit, and chickweed are waiting for the opportunity to sprout in bare areas. Treatments in October are effective in controlling young seedlings.
Weeds rob the turf of needed nutrients and space.
For me, I am going to rely mainly on cultural practices to heal my lawn problems. In some cases a little seed will be needed, which reminds me, I better get to work.