Not yet. I have absolutely insane tinnitus -- crazy high pitched, can hear it over any sound, too many tones to count. Also have hyperacusis but that's another topic. In any case, historically I've paid a lot of attention to this space.

Perhaps the most notable attempt at a cure was Frequency Therapeutics, whose efforts were promising, but unfortunately didn't pan out.

There's a constant churn of biotech companies trying to solve this, as curing tinnitus (and/or hearing loss) would be a goldmine, but no one has really gotten anywhere yet.

If you want to stay on top of it, the /r/tinnitusresearch is a pretty good hub, and there are a few mailing lists out there.

That said, over time I found that ceasing to follow all the promises and inevitable disappointments helped me better achieve the only real "treatment" we have right now, which is accepting it and slowly learning to live with it.

When there's a real deal cure, you'll know about it. Until then, I suggest not paying attention to the churn and the extremely dubious "treatments" out there.