How many fractional CO2 laser sessions are needed to raise a depressed scar on the bridge of nose? (Photo)

I’ve done 3 scar revisions ( 2 unsuccessful ones due to doctor’s incompetency & mistake ), and several laser treatment ( about 8-9 since ) but I only see slight improvement in the scar. Maybe because around the 4th laser treatment, I had a pimple directly on the scar thus slowing the process. I’m very self conscious over this scar as it’s been with me for 5 years and I just want to get rid of it. Please help