Misting is silly, especially in Florida where it's either too hot to last more than seconds, or 90% humidity, and double silly to Juniper foliage. The foliage of any plant is calibrated to whatever conditions it grew in and thereafter, a lot less sun or a lot more sun will be problematic. By now, after the plant has evidently been treated badly, it's too late to ask and answer what the exposure was when the plant was purchased. If it was on a bench in the middle of an acre of sun-up to sun-down exposure and you put it on the lanai where YOU might be comfortable, that would be nearly terminal. If it was in the shade house of a nursery and you put it on a bench in full sun you'd get the same outcome.
Nothing is forever, especially foliage. The eldest leaves will die after a few years, so inner-most leaves will be going brown on a continuous basis. The light green foliage in posts #10 & 17 is dead, it just hasn't fallen down yet. This is probably a dead horse, and over-fertilizing won't resuscitate the dead, but getting it into east only one half day full sun, watered with a hose once a day, and prayer, is about all you can do. Almost all plants need to cycle between wet-dry-wet-dry on a ~daily or so basis, especially plants with glossy, waxy, or otherwise non-porous leaves, like Spruce, Pine, Fir, and Junipers. Three days of soggy is no better than three days of drought. And stop the poking around in the roots. Repotting something that you can get a chopstick in is unnecessary. To this plant, that would be doing heart and brain surgery on the same day, -while you got him on the operating table.
Cut back the foliage that is dead leaf-by-leaf back to the base of the leaf, leaving the point of origin undamaged. Picture the sprays of leaves as your outstretched hand. Cut back to a knuckle/joint anything dead, leaving as much good or neutral or unsure leaf or wood. It can bud back, but this is getting to be pretty late in the 9th inning. You won't get a home-run. A string of singles is all you can hope for.
Next time you buy a plant, put your face where you want it. Look at the conditions from the plant's point of view, 24, 7. Go buy a plant you like the looks of in that condition.