For me, meditation has been the thing that has made the most difference to my tinnitus. After two and a half years of having the ringing, and gradually but surely developing more and more anxiety over it, I decided to give meditation a go. I was pretty doubtful that I'd get any benefit from it - it seemed like sitting in silence would be the last thing I'd want to do. It's about 8 months now since I started a daily meditation practice and (although the ringing is the same volume) I'd say that the emotional effects of my tinnitus are only about 20% of what they used to be.
When I first began meditating, I spent most of my time focusing on the noise (which I'd say varies between a 4 and a 7), and even though I had ambient background sounds playing through my headphones it'd often be hard to break from attention away from the tinnitus and back towards the breath. I used to think about the noise before I began the meditation, how much it would distract me, knowing it'd be an issue, and of course it was. However, as I've developed my meditation practice, it's become easier and easier not to think about the tinnitus. I think this is partly because my attention is much stronger and more under control than it was before. I also think that repeatedly labelling the tinnitus as 'nothing to worry about' and then calmly returning to focusing on the breath helps to train your brain to label the noise as something that it can ignore.
In the past few months I've started meditating without any background sound (or guided voice-over). At first this made me particularly anxious, and I had many sessions where I was particularly distracted. However, bit by bit you start to really take the power away from the noise - just being able to sit in complete silence and be okay with it gives you the confidence to deal with the noise during the rest of the day. It meant I stopped fearing times during the day when I knew I'd be in silence. And when the fear is gone it's so much easier to forget to even check that its even there.
There are loads of great meditation apps out there, and it's definitely worth starting with guided meditations. I used one called Aware to start with which has some good ambient sound options. 'The Mind Illuminated' is a great, secular and no-nonsense manual for mediation if you want to get a book on it
I plan to write up my experience in more detail soon on this forum.