There are different branches, and who can say what will work for your particular aetiology.
Did you read the section from the conference on neurofeedback?
There is a branch of evidence showing reduced Alpha and increased Delta activity in the brain. Learning to control the Alpha activity could reduce the volume of tinnitus, be that through Yoga, meditation, mindfulness, neurofeedback or whatever.
It's often about finding the right technique that makes the most sense to you. I suggest neurofeedback with a visual display judging your need to see results. In this way you have clear indicators that the technique is working or not.
Here is a review of neurofeedback
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5717031/
From the conference report, the neurofeedback presentation:
"They use visual feedback for their tests; a UFO travelling along a tunnel, alpha brainwaves control the speed and Delta controls direction. The aim is to balance things for a smooth ride. There was no placebo group for the data presented, however they did find that an increase in Alpha activity in those with tinnitus corresponded to a decreased loudness of tinnitus and decrease of tinnitus distress. When they followed up at 3 months the loudness had returned to baseline."
So basically if you stop training your brain it can go back to baseline - or in other words if you get back to obsessing / focusing on tinnitus the brain goes back to the same patterns. Nothing concrete but it's worth a shot because they did report a decrease in loudness.