If you're a full-time employee, ask your boss during your performance review for ONE suggestion of how you can improve or add a skill to enhance your performance. Knowing what the boss values helps you decide where to concentrate your effort and allows you to show progress by the time of your next review. If that's too uncomfortable or your boss refuses to make a suggestion, go to a trusted colleague who works with you. If you're a contractor working for an agency, ask the agency to find out from the client what one skill you could improve to be more effective. If you're self-employed, ask someone who works closely with you for one suggestion of what you could improve to make yourself a better technical communicator.
Skills determine performance.
If the response you get is a tool, save that for the next question. Probe for a more skill-oriented suggestion by asking what you already do that you could do better. Keep in mind that the skill may fall outside your formal education. For instance, you might be a great help author but need to learn more about telecommunications so you can work more effectively with your subject matter experts. Industry knowledge or more in-depth technical abilities can improve your job performance significantly.