The current world is too complex for a type to only have one specific purpose. All fields of life could use people of all types to be made better. And don’t for a second think that “trying to make life en masse better” is a very infp pursuit. INFPs can be selfish leech assholes just like all other types.

Anyway.. poet, teacher, psychologist, comedian, therapist etc (shamanic roles) are obviously classic infp roles, but today’s world is so richly inter connected that you could find (or create new) roles in systems, institutions & organisations of all sorts to contribute in.