Is it worth having a 2nd septoplasty following a failed surgery?

I had a septoplasty & turbinate reduction done 5 months ago. It seemed to help my mouth breathing as i have better flow out of my right side. But no change on my left side. The air flow is greatly reduced and labored. My ENT said the cartilage had reverted, but he could it again, a more aggressively this time. Do i have a better chance of success a 2nd time or more complications? I am 60 & have well-controlled diabetes, but have noted that i take longer to heal. Also have allergies to cats.