What's the best approach to lawn restoration?

I have about an acre that the builder installed sod in July of 2016 about 2 weeks before we closed. I live in the DMV and the sun was brutal. I was able to get an irrigation system installed at the end of September 2016 but until then I had a series of hoses and sprinkler heads running all over the place. Unfortunately the sun had done its damage. So in 2017, I hired TruGreen and it helped a little but not enough. Besides, it was expensive because i have over an acre. Every house I've owned, I prided myself on having one of the best lawns in the neighborhood. Until now I was successful. So does anyone have any advice on an approach/method of reviving my lawn? I want to do it myself and save some money which is important especially now with my daughter going off to college.

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