Septoplasty failed? My surgeon says the swelling is causing my congestion. Is the swelling permanent or will it dissipate?

Hi, it's been 5 months since my septoplasty and turbinate reduction surgery. Although I have experienced some improvement in my nasal breathing, I'm still congested on the left side of my nose. Taking an oral decongestant pill helps a bit but I'm disappointed the procedure hasn't fully worked by now. During a follow-up, my surgeon says everything healed up nicely but the swelling is causing the congestion. Is this swelling permanent or will it gradually dissipate? Thanks in advance for any advice.