Tinnitus is a symptom, not a disease in itself, and it can result from a wide range of underlying causes.
At present there is no actual 'cure' for tinnitus. However, many of the causes of tinnitus are treatable.
Easier said than done, of course, but it can be done ... with practice. Is persistence needed? Not in the sense of 'will-power.' (Actually there is no such thing as will-power. The will has no power in and of itself, but that's for another blog.) Here's another metaphysical law worth remembering ... 'Effort defeats itself.' Got the picture? So, forget about gritting your teeth and flexing your muscles, as though some form of mental toughness would achieve the desired result. No, the type of persistence needed for success, if that be the right word, takes the form of what has been described as an effortless effort ... in the form of an awareness, and 'noting', on an ongoing basis ... from one moment to the next.
Resource: Gans J J, 'Mindfulness-based tinnitus therapy is an approach with ancient roots', (2010) Hearing Journal, Nov 2010, v 63, issue 11, doi: 10.1097/01.HJ.0000390823.09995.f3