Tyler Heppell left his sales job to work on his family farm.Tyler HeppellFive years after working in sales, Tyler Heppell felt he had lost his purpose and quit.He intended to work at his family farm for a year, but he's now decided to stay for the long haul.Heppell, 30, said he has learned more about business by working as a farmer.This as-told-to essay is based on a conversation with Tyler Heppell, a fifth-generation farmer from Heppell's Potato Corporation in Canada.