My contributions to society are as follows:
I continue to remain employed full-time (the job itself doesn't matter; the point is, I'm not a burden on society by being unemployed).
My job is at a university, so that has direct societal benefits. In my case, aside from the obvious duties in teaching the workers of tomorrow, I will have to take part in community lectures, whether to a public crowd once a year or to high/junior high schools.
I also have been a neighborhood leader (chonai hancho), which may not have much in the way of responsibilities but is still a contribution.
As a member and officer of an English teachers' professional organization, I help other teachers (foreign and Japanese) by sharing my research, critiquing theirs, and serving as an editor to a journal.
I give annual speech contest training to members of the Self-Defense Forces.
I give training in making presentations to participants in the JICA program. They come from various African and SE Asian countries.
I also stay out of trouble with the law.
Good enough for ya?