If I had to pick one skill for the majority of leaders I work with to improve, it would be assertiveness. Not because being assertive is such a wonderful trait in and of itself. Rather, because of its power to magnify so many other leadership strengths.
Assertiveness gets a bad rap when people equate it with being pushy and annoying. But that shouldn’t stop you from learning to apply it productively (that is — in service to your strengths). More harm is done when people aren’t assertive enough than by being too assertive. At least….