How can my nose tip support be reconstructed after a poor septoplasty? (Photos)

It looks like you also had some reshaping of the tip: i.e. a rhinoplasty.   Tip projection can be restored with a cartilage graft but sine your septum has been resected this would require rib cartilage.   it is possible the cadaver rib could be used.

Before considering further nasal surgery, make sure you REALLY want it. Your tip may have drooped several millimeters after your surgery, but your nasal appearance in the photo looks reasonable. Further nasal treatments, surgical or permanent non-surgical, may be considered to improve parts of your nose you now dislike. Consider consulting with several rhinoplasty specialists so you could see what might be best for you moving forward. Hope this helps. Dr Joseph