As for the smell, what is the floor of your run composed of? Dirt? Shavings? Sand? How big is the run and how many chickens are in it?
I agree with the other commenters:
Add wood chips, some Sweet PDZ, or First Saturday Lime, rake through the run to mix up wetness.
		
		
	 
To this, I would also add - what part of country/state? Is run covered?
Even w/ the humidity here, my open air coops are open to the ground. So we use DLM. I've not always been able to get wood chips, but use chips, shavings,  sawdust, hay, straw, leaves, yard & garden debri, pine straw, PDZ & Dry stall (horse stall products), shredded paper/cardboard. The main thing is to either vary the materials or utilize materials of different sizes. This allows for aeration which works to dissipate the scent as well as to allow poop to disintegrate or decompose - aerobically.  All same size (especially hay, pinestraw & fresh mowed grass clippings) material can make stink worse as can pack down & become anaerobic- no oxygen & slimey.
If it's wet & stinky, it needs more material. Usually I will just dump materials & allow the chickens to spread it. But in your situation, I would spread it - at least a couple
Another thing - since you know the run itself can be an issue. Hose off/spray the chicken coop & if part or all of the run is covered, do the covered portion as well. You will notice a huge temp difference - even standing next to them.
Here are some of the applications of DLM I've used.
For some reason, I'm not able to use any of the ...  items.  You can copy/paste, I'm sorry!!
https://photos.app.goo.gl/3Z4ZpfpHr1Nr5DZC8