May we have some good photos of the base of the tree where it meets the ground.

Here is a link to the pictures of the base of the tree.
Thanks
https://photos.app.goo.gl/tjcbtMMf6Gx9Uj7g7

There doesn't seem to be stem girdling roots that I can see from photo unless they are below the surface. I also am unable to match the leaf damage to anything I am familiar with. A mature tree is a valuable addition to your landscape. I strongly suggest you have a certified arborist make an on-site examination of your tree and recommend treatment. 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/