Your nose is stuffy not because of the mucus but because of the inflammation of your nasal passages. It could be because of an infection, it could also be allergies. However reduce your sugar/carb intake and increase your blood flow through exercise or additional physical activity, that can definitely help as lots of refined sugars naturally cause inflammation in the body.

Stress, spicy food, sugar, and some medications can also increase inflammation.

As far as "unstuffing it goes" you can take antihistamines and see if its allergy related or take aspirin or other anti-inflammatory drugs.

I am not a doctor, nor am i qualified to give medical advice but this is what I have learned so far.