The below are not in any specific order, we can do that later.
1. Use some Long Tail URLs - suggested by Cees
2. Backlinks - (one way, not reciprocal, with high PR if poss, if not any will do) - suggested by dialaroom
3. Age and Content - Henri's video
4. Avoid excessive duplicate content with another website in the Keywords - suggested by Aled
5.Another minor but extremely important one is to always add a title to your .tel. Never leave it blank - Aled