The fastest way to raise your level is to play every day.
The consecutive days played (CDP) bonus gives you an extra 880 XP.
Any form of game counts for the CDP bonus....
Play stroke play tournaments. They give you an extra 180 XP for nine hole tournies and 400 XP for 18 hole tournies.
So if you are looking to level quickly, play the 9 hole and 18 hole unlimited tournaments.