Has anyone successfully reduced or gotten rid of buffalo hump ?

I’ve had a buffalo hump for a long time. I’m 25 now. I think it’s because of bad posture and some weight gain. I’m not overweight, but I’m not very fit either. How can I actually get rid of it? I’m working on my fitness, but how do I improve my posture? Do YouTube videos really help? Please suggest something that can help reduce the hump.