From an article titled 5 Things Super Lucky People Do:
The [successful] competitors are simply swinging the bat more often.
What is the meaning of the phrase swing the bat more often?
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The article makes a point that those successful competitors (salespeople) are not lucky. They simply make more attempts (in other words, they make more calls). The article compares the sales with a popular sport, baseball.
According to Wikipedia,
Baseball is a bat-and-ball game played between two teams of nine players each who take turns batting and fielding.
The offense attempts to score runs by hitting a ball thrown by the pitcher with a bat and moving counter-clockwise around a series of four bases: first, second, third, and home plate. [...]
When a play starts, the batter will swing the bat the best they can, trying to hit the ball thrown by the pitcher. All things being equal, a batter who swings more often will hit the ball more often.