man to be honest either start over or try cutting the stem and rooting it from the stem, basically doing what you would to clone. im not sure this will work but just look up how to clone. but it migth not root because too much energy is going to leaves. if you supercrop a little now the "clone" it in an essence, it migth save it and let you get a somewhat decent yield. btw i dont know if this will work just throwing out some ideas of what might help. your too far stretched to really get any kind of a yield and it would support its weight. is that how you got it and how far away was your light. you need much more light and should be a few inches from top of plant.