what's the humidity like where you are? Fukien tea is tropical and like some humidity, I would say at least around 50 percent. Look closely for new shoots growing somewhere like out of the tips of a branch or one of those 'nubs'. Those woody nubs were shoots that were pruned at one point and it looks like growth came forth. I'm not sure if its the photo lighting but your leaves look slightly lighter green than you would expect. Idk about banana peel but you can buy a ten dollar ph reader and check the acidity of your water and adjust it if you have to. Could also be a iron shortage i think(anyone knowledgeable on this?), which is fixed with iron supplement via fertilizer. Also, make sure its not getting too much sun i suppose, I have read many different opinions on how much light they need on here but i believe if they are outside they don't like more than an hour or two of direct sunlight each day. Too much could theoretically have caused yours to go dormant like some plants do in the heat of summer. On the other hand I see your in Michigan so not too far from Canada, so they also don't like cold temps below 60 degrees F. In montreal, mine sits inside by a window, 10 inches behind glass, that gets morning sun from about 8 to noon when its not cloudy, which seems to be about half the time in the fall/winter where I am. I also have a small led grow light that I put on in the afternoon, sometimes full day. I have a humidifier that keeps the room around 50-55 percent humidity and I water about every 2-3 days(when the top inch of soil dries out a bit, i just touch the top and gauge the moisture/bounciness of the soil to the touch to avoid packing the soil down and decreasing drainage), in summer Ill just open the window if its above 20 Celsius. I feed every two weeks in growing season, every 4-6 weeks in winter/when its not growing, with solid fertilizer (15-30-15) (its solid but u mix it with water so idk what that makes it)that I got from the shop who sold it to me, but if yours isn't growing I don't think you're supposed to fertilize it.