The Cochrane Collaboration does systematic reviews of the research into health interventions.

There are quite a few reviews of different tinnitus interventions here, from zinc supplements to cognitive behavioral therapy https://www.cochranelibrary.com/search

One common theme skimming through is that there is no intervention known to be effective for everyone. But it is worth looking at the ones that have been studied and seeing if any might be worth trying for you.

Full disclosure: I work for the Campbell Collaboration which is essentially the sister organization of Cochrane doing systematic reviews on subjects outside of health (education, crime prevention, business and management, international development and lots else) campbellcollaboration.org/