The main goal should be to do everything possible to avoid making tinnitus worse. Primarily, that means keeping hair cells healthy-by keeping toxins out of the bloodstream, protecting them from anything approaching high SPLs and maximizing naturally produced anti-oxidants, especially glutathione. Of course, this means zero smoking of anything, minimal or zero alcohol and sugar consumption, plenty of plain water and dark green/red/yellow salads, wild caught fish, eggs, chicken-all of those things you should know by now to eat the most and the least of. When not eating my daily big plate of salad, I steam broccoli, peas and carrots. Then put them in a pyrex dish, add a little sugar free BBQ sauce, water, garlic powder, microwave on low for 33 seconds. Then add plenty of ground brown or black mustard seed. Broccoli is a rare source of superoxide dismutase and finely ground black or brown mustard seed unlocks the broccoli's sulforaphane.
AND plenty of exercise!! There are two schools on this. One is performing select beginner/intermediate/advanced Yoga asanas. The other are rounds of high intensity interval aerobics, like 12 to 15 minutes each on a programmable bike and a treadmill, plus equal time on sets with weights and/or weight machines. I prefer alternating between both schools but in either case if not everyday then I would aim for hour long sessions every other day, which is what I do. Such activity, plus ample and restful sleep, will maximize production of glutathione, the body's most powerful anti-oxidant, maximize new brain cell growth and neural network health and minimize dementia risk, all of which will help protect hair cells and thereby reduce the likelihood of worsening tinnitus.
But keeping your ears away from loud events, however infrequent, is absolutely essential, and is the main reason why I quit using headphones long ago. A study done about ten years ago claimed that ~ 5 million Americans under age 16 have partial hearing loss due to high SPL exposure from concerts, home sound systems and perhaps especially mp3 players, which they used almost invariably with headphones-or even worse ear buds. If I couldn't wait for home sessions with my floor standing speakers I'd use good quality powered speakers, even battery operated ones, for portable audio use. Using headphones, not to mention ear buds, are irreversible hearing loss accidents waiting to happen. Use them at your own risk.
Last, but hardly least, when in cinemas or driving keep your windows up and/or wear disposable or washable ear plugs, as I always do. And if you are a concertgoer be sure to invest in musician or acoustician type ear protection.