Whenever I have congestion I take a steamy hot shower and the steam helps to get rid of the congestion.
Staying hydrated by drinking plenty of water and even warm tea as well as using a humidifier can help to keep congestion away.
If you have a stuffy nose then clearing your nasal passages with a saline solution using a Neti Pot can also help.
You could also breathe in steam from a pot of warm water and even try propping your head up when lying down.