Never let yesterday’s capacity write tomorrow’s job description.

Deciding what to take on based on what you can currently do keeps your work permanently sized to your past. Some of what you accept should require you to grow into it, since that is how the growing usually happens. People who only agree to what they already handle comfortably tend to stay exactly where they are.

Take on one thing this year that you are not yet quite equipped for, chosen so that failing would not be catastrophic. Then build the ability while doing it. That sequence is more common than being ready in advance.