Will Fillers Help Fix Nose Tip After Bad Rhinoplasty?

You would be surprised how much improvement you could see after a well-done, Injectable Filler treatment. I'm not completely certain you would benefit without seeing your photos. I have been able to achieve pleasing, permanent improvements of the nasal-tip, using Silikon-1000, after Rhinoplasty Surgery.
I've attached a link for your perusal. I hope this is helpful for you.

Fillers are a bad idea to be placed on the nose because they can extrude, become infected, necrose skin and present surgical problems later on in life. It is best to stay away from dermal fillers in the nose. Revision rhinoplasty surgery can be performed to further balance and shape the nose and lift the tip, which is drooped.

Tissue fillers are best when a nose requires 'addition'. They mostly don't help noses that require 'subtraction'. But like everything there are exceptions. Injections can hide certain crooked noses but filling in the concave side of the nose. A filler can also straighten the profile of certain nasal dorsal humps. They excel at camouflaging minor irregularities after rhinoplasty. But the operative words are 'subtle', 'minor', and 'small'.
From your description, I’m sorry to say but your nose sounds like you will need a revision. However if you are reluctant, and just about everyone who needs more surgery is; to convince yourself surgery is your only solution, why not have your surgeon inject your nose with a salt solution called 'normal saline'. It will give you similar results as with semi permanent fillers like Restylane but will be resolved within a day. That way you can 'test drive' your new nose. I think that will convince you it's not an option for you.