No I do not believe thread lift will help you with post-blepharoplasty lower eyelid retraction in any long term fashion. Best to have more detailed evaluation with expert.
Any procedures have complications. PDO threads do not have the most dangerous complications compared to fillers. Filler complications such as skin necrosis and blindness from injection inside blood vessels and arteries. But, thread lifts also have complications. It is less safe to get this...