Air flow temp problem

My GPU always max out at 83C (max operating temperature). I cleaned everything, I installed a hanging fan that blows the hot air away from the GPU. When I leave my case open it maxes out at about 79C what is ok but not optimal. Are there any ways to improve the air flow in this situation?

My GPU always max out at 83C (max operating temperature). I cleaned everything, I installed a hanging fan that blows the hot air away from the GPU. When I leave my case open it maxes out at about 79C what is ok but not optimal. Are there any ways to improve the air flow in this situation?