Never forget those who have helped you grow as an individual and as a professional.
Never forget those who guided and helped you, and fostered and facilitated your personal and professional maturation. Reach out to these individuals regularly to say hello and to reaffirm your gratitude to them.
Just as important, remember that your duty as a leader is to grow the next generation of professionals and leaders. Intentionally cultivate those with talent, emotional intelligence, interest, and drive to develop to be the leaders of tomorrow.