Unhealthy plant not coming back to health

If you've tried everything and the plant won't bounce back and display a more healthy appearance despite your best efforts above the soil line, in my opinion, it's time to start thinking about the root zone. After looking at your plant and reading your blurb i thought root rot could be whats going on with that plant. For about 25$ you can get a small bottle of something called Hygrozyme which is an enzyme that will eat and break down dead and rotten roots and turn them into plant nutrients. Advanced Nutrients has one called Sensizyme. Most nutrient companies have 1. I use Hygrozyme personally.