To quickly unblock your sinuses you can try using a Neti pot, nasal irrigator, or bulb syringe which can help clear out your nasal passages so that it makes it easier for you to breathe.
Clearing out the nasal passes is an easy way to get your sinuses unblocked.
You can also use a nasal saline spray as well.
And use a humidifier or vaporizer in your room to add moisture to the air which can help keep your nasal passages clear and your sinuses unblocked.
Drinking plenty of water and other hydrating drinks is a good thing to keep your sinuses clear and unblocked as well.
Taking a long hot steamy shower or just sitting in the bathroom with the shower running at full hot steam can help add moisture to your nasal passages and help unblock your sinuses as well.
You may need to see your doctor and get some sinus medication or try some over the counter sinus medication as well.