Not a cure, but mine naturally fades a bit if I avoid exposure to further loud noises by carrying earplugs. And I check sound levels sometimes with an iphone app - anything touching 100db, it's the earplugs.

I think the body's healing processes can be quite slow especially with nerve related stuff. Here's a guy on the tinnitus forum where it took 3 years to fade for example https://www.tinnitustalk.com/threads/my-tinnitus-is-almost-g...