Americans are ditching their jobs by the millions, and retail is leading the way with the largest increase in resignations of any sector. Some 649,000 retail workers put in their notice in April, the industry’s largest one-month exodus since the Labor Department began tracking such data more than 20 years ago. Some are finding less stressful positions at insurance agencies, marijuana dispensaries, banks and local governments, where their customer service skills are rewarded with higher wages and better benefits. Others are going back to school to learn new trades, or waiting until they are able to secure reliable child care. “It was a really dismal time, and it made me realize this isn’t worth it,” said 23-year-old Aislinn Potts of Murfreesboro, Tenn., who left her $11-an-hour job as an aquatic specialist at a national pet chain in April to focus on writing and art. “My life isn’t worth a dead-end job.”