Every founder is subject to burnout, even the founders of a massive lifestyle, retail, and media brand. Joanna Gaines, co-founder of Magnolia, launched the brand alongside her husband, Chip, nearly 25 years ago. After gaining prominence for renovating houses on the HGTV show Fixer Upper, the two used their company to transform the city of Waco, Texas. They realized they needed to take a break. On Monday, Gaines discussed how the couple took a th…