Watch and see what other people are doing. Find better ways of doing things. Ask people questions to stimulate their thinking. Do not discourage others. CEOs are publicly modest.
Secure people can be publicly modest.
Insecure people are not. Do not be shy or undervalue yourself. Do not brag about yourself. Do not over self-promote . Remember that someone else can offer a testimonial about you that can say everything better that can be said about you.