I am hesitant to write this as I no longer experience Tinnitus and know it is awful.
When I was 15 I discovered a way to not experience Tinnitus. I did not know at the time not everyone experienced it and had no name for it. One summer I swam twice a day and found that if I dived deep enough to make my ears ring then the "noise" in my ears went away.
When winter came and I could not swim the noise came back. I would take a bath and blow out my nose and mouth. I found that if I put my face in a bowl of cold water and blew out my nose and mouth the noise went away.
I still swim and dive and do handstands in the water. I sometimes use a bowl of water but no longer use cold water.
So I am not claiming to know anything or advising , I am simply sharing in case this resonates.