I'm not a doctor so all I can do is point you to places like [1] though I've had tinnitus for 30 plus years. I worked around loud equipment with inadequate ear protection - but the defining blow was having my head beside a push bike tyre when it exploded resulting in partial deafness for a day or so.

It's different for everyone, mine is actually damage to the small hearing hairs so no cure hope at all. It takes a while for the brain to adjust and slowly ignore the noise but only to a point. Different things work and you've probably been told about white noise could could help out.

For a start my tinnitus was like standing on the tarmac beside a jet screaming its engines ... making any conversation a great deal of effort trying to ignore the loud whine. It eased over the years where I could almost mistake it for a loud chorus of crickets or cicadas at night, which strangely was more easy to think that's just what it was. Mostly though lately I can ignore it or simply forget it's going on.

[1] https://hearingandme.com/can-tinnitus-be-cured-what-science-...