I think there is no criterion for importance. The people whom we consider important do not consider themselves important. Only others perceive them to be important. If importance is a matter of perception, you have to first perceive yourself important.
For me to become an important person in the society, I'll just do the right things needed in the environment. I will do right things effectively and influence the people around me. I'll share my knowledge and wisdom about things to be able to expand the good deeds within me. I will set an example on how to be efficient and effective member of the society.