I want a greener lawn!

Really have appreciated the help you have provided! Thought I would post an update. After taking advice from you and watching several “Lawn Care Nut” YouTube videos I think I’m making some progress! Last September I core aerated my lawn, overseeded with tall fescue and Peat moss and waited. As of March I’ve noticed a greener lawn but some areas with weeds(lighter color grass, yellow nut sedge), sprayed the Spectricide and then threw down some Milorganite fertilizer about two weeks later and it seems to be looking much better! I have an area that is exposed to the sun quite a bit that is a little more brown than the shaded areas, thinking about putting down some AquaSaver in the soil to see if that helps? Also thinking about overseeding with Kentucky Bluegrass in September, what are your thoughts?