Stay authentic
Developing your assertiveness does not mean that you have to change your character. It means to wisely decide how you will behave. Nobody says you have to be assertive all the time. Find your own style, do not copy others.
Remember the boundaries of assertiveness
Pay close attention not to become an aggressor or to be perceived as excessively arrogant by the people around you in your pursuit of greater assertiveness. Watch the impact you have on the others.
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Article source Harvard Business Review - flagship magazine of Harvard Business School