As general advice:
Mow medium low (3-4 cm), and often, and keep feeding it (NOT with weed and feed), and eventually the finer-textured grasses--such as creeping fescue and bluegrass--will take over. The coarser species don't like to be mowed low. Spot spraying with a selective weedkiller may still be necessary to deal with some of the lower broadleaf weeds. Spreading hot-composted cow manure--often sold as "weed-free"--in spring and early fall will help keep your soil happy with less scarifying and aerating, which provide openings for weeds. Others will probably have better specific advice for your area.

Keep mowing the lawn every 3-4 days and it will improve as the grass grows side ways and thickens You can apply weedkiller once again after about 6 weeks see instructions. Dont feed more than twice in one season The more you cut the weaker the weeds and the stronger the lawn grass.

Usual practice with granular weed and feed applications is one in April, and one six weeks later. Do not use any feed on your lawn past mid July, though you can still apply a mosskiller if you want.

Ah! We feed monthly March through October here, or all year if we have a winter lawn. But that's a case of different grasses in a different climate!

No need to rub it in, Tugbrethil, lol! General rule here is don't feed anything at all past mid July, unless its veggies which may need it, or annuals that you're binning in September.

What's to rub in? Sheesh, the water bills! Ay, caramba, the bugs! Bother, the mowing! That's why I just help out with my neighbor's lawn, nowadays.

Oh my heart bleeds - I'm sitting here with the heating on, believe it or not - its raining, cold and damp, and my arthritis really isn't happy. Though thank heavens, really, at least the garden's getting a good soaking, it certainly needs it.

Bless you, Bamboo! I hope things look up soon. Let it rain as at Camelot--only from midnight to 3:00 am!