I have tinnitus from heart meds. I've found tapping the back of my skull with both index fingers 20-40 times reduces it considerably. Not sure if it's placebo or not, but it does the trick for me.
- https://trudenta.com/this-simple-trick-may-help-with-tinnitu...
First time I did it, it was profound. I hadn't realized how much I missed complete silence.