It is not unusual to have a blocked nose even after six months of undergoing rhinoplasty during the healing process. It may be due to residual edema or changes in the nasal tissues. To this end, seek advice from your nose job specialist for comprehensive assessment. They can ascertain whether the obstruction is a part of normal recovery or if it requires further intervention. In the interim, try saline nasal sprays do not use decongestant nasal sprays , and ensure that you are in a humidified room to ease these symptoms.

Experiencing a blocked nose six months after rhinoplasty can be normal in some cases, but it's essential to consult with your surgeon for a proper evaluation. While the majority of swelling and healing typically occur within the first few months following rhinoplasty, it's possible for residual swelling to persist for a longer period, especially in the nasal passages. Residual swelling, Scar tissue formation, Nasal valve collapse can be the reasons for blocked nose at this stage. 

If you're experiencing a blocked nose six months after rhinoplasty, it's important to consult with your surgeon or an otolaryngologist (ear, nose, and throat specialist) to determine the cause and appropriate course of action. They will be able to evaluate your situation and provide you with personalized advice based on your specific circumstances. In the meantime, here are a few general suggestions that may help:

1. Follow post-operative instructions: Review the instructions provided by your surgeon after the rhinoplasty and ensure that you are following them correctly. This may include nasal sprays, saline rinses, or other prescribed medications.
2. Nasal irrigation: Consider using a saline nasal rinse or a neti pot to help flush out any mucus or debris from your nasal passages. This can help alleviate congestion and keep your nose clear.
3. Humidify the air: Dry air can exacerbate nasal congestion. Using a humidifier in your living space or bedroom can add moisture to the air, reducing the likelihood of a blocked nose.
4. Avoid irritants: Minimize exposure to irritants such as cigarette smoke, strong chemical odors, and pollutants. These can further inflame the nasal passages and contribute to congestion.
5. Elevate your head during sleep: Keeping your head elevated while sleeping can help reduce nasal congestion. Try using an extra pillow or consider using a wedge pillow specifically designed for this purpose.
6. Avoid blowing your nose forcefully: Blowing your nose too hard can potentially disrupt the healing process and worsen congestion. Instead, gently blow your nose with one nostril at a time or use a saline nasal spray to help clear your nasal passages.

Remember, these are general suggestions, and it's essential to seek professional medical advice for an accurate diagnosis and appropriate treatment.