In "My Not So Perfect Life," Sophie Kinsella explores the complexities of modern life and the pursuit of happiness. The protagonist, Katie, navigates the challenges of her professional ambitions while grappling with the realities of adulthood. Throughout the narrative, she confronts the notion that achieving success often requires personal sacrifices, leading her to reassess her priorities and goals.

The quote, "Every promotion requires you to do less of the thing you originally wanted to do," reflects the theme that upward mobility can come at a cost. As Katie climbs the corporate ladder, she realizes that the responsibilities and expectations of her new role detract from her passion for creativity and her original dreams. This insight reveals a deeper commentary on the trade-offs individuals face in their careers as they strive for success.