The author (not pictured) has been a freelancer for nearly a decade.Luis Alvarez/Getty ImagesI've been a freelancer for nearly 10 years, and my career is stable.However, I always feel a low-grade uncertainty.I make sure I'm constantly adapting along with my industry and looking for new opportunities.When I became a freelance writer nearly a decade ago, I assumed the uncertainty would eventually fade. I imagined there would come a point where I'd…