Craigslist for aerating. You can also rent one and do it yourself.

Don't know if KC has trugreen. For lawn treatment, I can't say enough about their results. It's expensive, and they try to oversell you a lot of shit, but it works.

I have Trugreen in KC. They came out an aerated my lawn and dropped seed on the hottest week of the year. Very little took. Also, they never gave me a service schedule. I'll just come home to an invoice in my door. Not really a big deal, but I keep a pretty stern budget and like more than a couple days notice on a $150 invoice.

I would put some kind of weed and feed down in the fall and then a pre-emergent in the Spring. You'd be surprised how quickly the grass can come back and start choking the weeds out. A lot of weeds are just annual type. They'll die over the winter, and then if you put some type of weed protection down in the spring it will keep them from coming back.
I'm no expert but that's what I did on my lawn when I moved to our new house. The yard was like 80% weeds in the front when I moved in. Now it's all grass. Of course rabbits ruin it anyway.

Tear the whole thing out and put in field turf.....never have to mow again.

depending on the size of my next yard, I'm seriously considering this. at least for the front.

PM Duck Dog. He owns a lawn care company and is a great guy. His company is based in Johnson County as well.

Bermuda..never have weed problems again and is shorter mowing season.

Sounds like Phoenix, except they use rocks

I just killed my entire backyard. The previous owners didn't do much yard work either. I will have someone come aerate it in a day or two. My brother had a guy do his yard for just $50 after seeing a sign on the road in his neighborhood for it. Way cheaper than some company and way easier than renting a machine and doing it yourself.

and Zoysia; if you can tolerate the late green-up.
my first house had it in the front; shit was like carpet. so thick my mower would slide around on it.

though, I needed to aerate at least once a year.