"who don’t focus"

"Many salespeople fail to develop new business because they’re wandering aimlessly. Too often, they’re not locked in on a strategically selected, focused list of target customers or prospects.
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Sometimes they fail because they don’t invest the time and brain power to ensure they are calling on the right accounts. Even the best talent will have a hard time succeeding if their efforts are directed in the wrong direction. However, more common than flat-out calling on the wrong list are salespeople who don’t focus on the list they have. Salespeople are famous for lack of discipline and losing focus. They attempt to call on an account (once), but don’t get anywhere. Instead of sharpening their weapons and continuing to attack the same strategically selected targets, they turn and pursue a new set of prospects. This constant change of direction becomes their death knell because they never gain traction against the defined target set.
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In my personal sales experience and what I’ve seen from other top performers, new business success usually results from a combination of perseverance, creativity, and resilience while staying laser-focused on a well-chosen, finite list of target prospects."

Trecho retirado de "New Sales.Simplified" de Mike Weiberg.