Use a product like Weed and Feed. Not only do you get rids of weeds, but you also fertilize for a greener and fuller lawn. We've had success with it in our yard: https://amzn.to/2EknX04 (affiliate link)
Spectracide Weed and Feed in the hose end sprayer.
You could give these a try.
This article looks at all the common natural weedkillers and is really helpful