Why is my plant shedding its leaves?
Bit of a long story here. I got this agave plant three years ago, and during most of that time I kept it indoors. However, its lower leaves have been shriveling and falling off, and I learned that this is because these plants need even more sun than most succulents, and should be outdoors. I put it out on my porch this August, taking about a week for it to acclimate to the sun. Unfortunately that still didn't help. The first photo you see is what the plant looks like today, and the second one is what it looked like earlier this summer.
At the same time, I moved it into a smaller pot with grittier, better-draining soil, because the pot I had been keeping it in was too large, so water wasn't reaching the roots. I watered it yesterday after having not done so for almost a month. But despite all this, one of the two remaining leaves is still turning yellow and shriveling up. The central spear still seems to be healthy and so do the roots, but why does the plant keep losing its leaves? What can I do about this? Should I bring it indoors again for the winter (I live in North Carolina)?