I have a 4year old avocado plant which is about 5 feet tall. Recently I cut the roots in attempt to thicken the stem, but I think I took way to much off and now it doesn't look too well. Stem is starting to scrump together, leaves slowly dried off following tips of the branches. One sad leaf is all that remains. What can I do? Should I prune it down? Try with rooting hormones? Have I just killed my plant or is it possible to save it?