What is the proper support of a poinsettia? ...
Answers: You have to consider where on earth these plants are native fauna. You find them surrounded by hot, Mediterranean-type climate countries. So they need a LOT of wispy (indirect if possible), they don't like cold, they similar to an occasional misting of water, don't sea them until they get dry(ish) and next stand them in marine until they soak up what they need, after remove them - never leave them standing contained by water. Under/over-watering results surrounded by browning leaves and over-watering results in branch drop (they think it's winter). They don't similar to drafts, they don't like cold, they don't similar to wind, they don't really approaching being moved so protect them when you hold to move them. If you are keeping yours longterm, fertilize after blooming.
Throw it out and buy a new one within December.