No one needs to praise oneselfIf you are sure that your doings are excellent, there is no need to walk with announcements about that excellence, people will recognize it by hearing and seeing. If there is a core then no need of preaching about abilities, it will be clear through actions. Those who perform below average may have to convince others of their 'extraordinary' skill by campaigning. Owners of brilliant performances do not need campaign strategies. Skills and competencies can only be credible if it talks about their owners, rather than someone talking about their own merits.
Only those who are willing to become smaller can grow high. Those who are not will fall for their ego. Who would want to hear those who praise themselves?