Drink plenty of water
Use a saline nasal spray
Rinse with a saline neti pot
Inhale steam from a hot shower
Apply a warm compress to your face
Sleep with your head elevated
Use a humidifier
Blow your nose gently
Try over-the-counter decongestants if safe for you
Use over-the-counter antihistamines if allergies are the cause
Avoid smoke, dust, and strong odors
Rest as much as possible