Promoting your own accomplishments can feel uncomfortable, and poses a dilemma: It can make you appear more confident and capable, but can also make you seem less warm, less friendly, and more selfish. On the other hand, self-deprecation or deflecting credit, may make you seem approachable but it diminishes your competency. New research, based on a series of 11 studies, suggests that dual promotion — in which you compliment a colleague or peer while talking about your own accomplishments — can both boost perceptions of warmth without harming perceptions of competence.
Source: How to Self-Promote — Without Sounding Self-Centered | Harvard Business Review