Laura Gio Carroll went on her first cruise to celebrate her 40th birthday and rethink her career.Laura Gio CarrollLaura Gio Carroll felt stuck in a rut, so she left her partner at home, and boarded a cruise by herself.Carroll had little interest in cruises, but a writing retreat aboard the Queen Mary 2 intrigued her.Since the cruise, she's been questioning whether her full-time corporate job is the right fit.Like many people, I hit a rut in my late 30s.