Whatever increases our self-confidence can make us “luckier.” 

In his research into luck, Richard Wiseman established four principles.

Via The Luck Factor: The Four Essential Principles:

Principle One: Maximise Chance Opportunities

Lucky people are skilled at creating, noticing and acting upon chance opportunities. They do this in various ways, including networking, adopting a relaxed attitude to life and by being open to new experiences.

Principle Two: Listening to Lucky Hunches

Lucky people make effective decisions by listening to their intuition and gut feelings. In addition, they take steps to actively boost their intuitive abilities by, for example, meditating and clearing their mind of other thoughts.

Principle Three: Expect Good Fortune

Lucky people are certain that the future is going to be full of good fortune. These expectations become self-fulfilling prophecies by helping lucky people persist in the face of failure, and shape their interactions with others in a positive way.

Principle Four: Turn Bad Luck to Good

Lucky people employ various psychological techniques to cope with, and often even thrive upon, the ill fortune that comes their way. For example, they spontaneously imagine how things could have been worse, do not dwell on ill fortune, and take control of the situation.

Wiseman also laid out actionable tips for becoming more lucky:

Be open to more opportunities, interact with a large network of people, break routines and keep a relaxed attitude toward life.