Ears are so unpredictable and varied in their behavior. I've had tinnitus that gets louder or softer, changes pitch, sometimes nearly fades for an hour or so at a time, for the past 25 years, at least. At times I get spasms in my eustachian tubes that cause loud, irregular clicking – this is often triggered by a loud sound, sometimes just the radio or normal voices. I'm sensitive to loud sounds, too, so maybe this is just my body's way of objecting to noise.
My hearing is unusually good for my age, in spite of the unwanted internal noise, but I've been careful most of my life to avoid loud environments unless I'm wearing ear plugs.
I have gotten so used to the ringing and clicking that I hardly notice them any more. It took years to get to this point, unfortunately. But when I finally stopped thinking I "shouldn't" be plagued with this problem, it ceased to be a problem. Tinnitus is so common in my age group (60's+) that I've polled various friends about how they deal with it. Some, like me, just accept it as part of life, and are not tormented by it. Some, who have had the good fortune of not having too much going on medically, are depressed or angry because of it. (I have so much other pain that outscreams the ringing ears that they are really a minor problem in comparison.)
So, I don't know exactly how one gets to the point of acceptance, which I'm sure is a solitary and unique journey for each of us, but that's what I recommend. That doesn't mean, of course, that you can't/shouldn't try to fix it if a solution comes along. It just means you accept that it's part of your life for now.
Since two weeks of magnesium helped before, I'd be inclined to try that again. Our bodies do gradually deplete magnesium if we don't take it in regularly, and magnesium is a common deficiency in many people. You could also check your blood pressure, which in my case is often low when the ringing is the loudest.
Wishing you wellness!