The leaves I can see look like ash leaves but they are so distorted it is hard to be sure. Your tree does have a problem. The thinning canopy is a symptom. You need to have a certified arborist come out and make a house call to diagnose the problem. Emerald ash borers leave a D shaped exit hole. But there could be other reasons. Go to this web site and click on Find An Arborist. Once your location information is entered a list of certified arborists in your area will appear. https://www.treesaregood.org/