Nose is collapsed on one side. How can I fix it?

This can have a number of different causes.  The most common is a soft or crooked columella.  A columella strut may be useful, but you will also have to look and make sure the septum is straight and the alar rim is strong enough.  Get a consult with an experienced nose surgeon.  This is a complex problem. 

Thank you for your question. It is somewhat difficult to make any strong opinions without photos or an in person examination. Straightening the columella is a common objective in many rhinoplasty procedures and we have good techniques to address the issue. There are also other reasons why the nose can look different on one side which is why a consultation is very helpful. Best wishes.