I have found notch therapy to be quite helpful. It's basically where you tune a note to your exact tinitus pitch and then create white noise that has every khz EXCEPT your pitch. Then you listen to the notched sound at about the same level or slightly higher than your tinnitus. So, basically your "tinnitus" is notched out of the sound. The theory is it can retrain your brain to not produce the fake sound. I also just find it helps to alleviate the symptom.

My own tinnitus is 15khz which is annoyingly high. And I suspect the reason why tools like Tinnitus Neuromodulator don't help much in my case.