The best suggestion I have is just accept that you have tinnitus and pay as little attention to it as possible. My tinnitus bothered me much more when it was at a much lower level than it's at now. Then I decided I just had to accept that it was going to be part of my life and I had to stop letting it bother me or it would drive me nuts.
I can listen to my stereo or even sit in a quiet place without noticing the ringing. I only notice it when I think about it, like right now, but I just try to focus on something else and before long I’ll forget about it.