IMHO if you wanna have impact, you write. You write theatrical plays, social and political philosophy, satire, comics, songs, whatever.

Anything that will connect someone in 200 years from today, with your mind and soul, can make a difference.

At least, this is how I feel when I read poems, watch a play, read a book or listen to a song.

ps. A prominent example is Tolstoy. The impact his writings had on Gandhi is outstanding IMHO.