I know I can make it instantly worse by clenching my jaw, so that should have been a hint already.
There are some physical therapists (also dentists) that focus on maxillofacial dysfunction and TMJ disorders, so that's an avenue to go down as well.
The other two common reasons for tinnitus:
* Hearing damage (gunshots, explosions, etc.) and those are not reversible as of yet
* Ototoxic drugs. When I last did research on it it years ago, like hearing damage from gunshots, was also irreversible.
I've had like 2/10 tinnitus for all my life, can't remember the last time I heard "silence".
Got a C5/C6 hernia a year ago, about 6 months after that MASSIVE tinnitus in my right ear and clear increase in the left. Like "can't hear shit" levels of noise.
Eventually I figured out that doing a basic shoulder workout + going on a walk eased it off in a few hours. A month ago, due to a doctor's suggestion, I discovered that taking muscle relaxants just before going to sleep a bit, I've woken up with maybe 3-4/10 tinnitus a few times.
Definitely a neck thing.