If you can't answer yes to the following then you may be selling your career short.
Do you volunteer to take on small tasks that aren't in your job description?
Are you sharing positivity and not negativity?
Are you one that can be trusted to show up on time and stay when it really matters?
Do you see connections between coworkers that will help the bigger picture?
Are you providing a professional appearance in what you wear and how you communicate?
Adding value isn't to be confused with never saying "No" again. It is about using your time and resources in a way that makes sense to getting the most out of both. Be smart about the days you come in early or stay late. Be smart about who you spend time with at the office. Use your resources in a way that always get the most and the best from a situation.
Just add value!