hi sir,
you did not state your course of studies. so it's difficult to advise u.
what i can share is, corporate organisations are profit-oriented. they expect u to work on niche areas and contribute to positive cash flow. making a positive influence like what u've described is last on their priorities.
even being a doctor has its own politics. there's always a bad sheep within a group. i've hear of stores whereby even doctor can declare patients as having cancer for no reason, and then sending them off to expensive chemo sessions. pls don't quote me, but please do your own research.
if you wan to help society, i suggest u:
1) take on charity work.
2) work in government sector. for example, join the army and protect our nation and people. i'll be more than ever grateful.