Pretty much what I've been doing without having known about it. I don't hear it unless I think about it.I only have tinnitus when you guys bring it up!
Seriously, it's a mental feedback loop, you can mentally reinforce or cancel the noise, Your choice.
My ignoring it is DIY, but it's a studied and applied therapy.
One link;
https://www.ata.org/train-the-brain-to-tackle-tinnitus
Worth looking into?
Jim, I can't even imagine dealing with that!