How expensive would it be to be evil, effectively?

People often use the 'effectivenes' of a given charity to decide which to donate to, to maximize the amount of lives saved/good done in the world (vague concepts, I know, but bear with me).

What if I wanted to do the obvious? How expensive would it be to end some random life? If I wanted to maximize the amount of suffering and misery added to the world, how would I go about it? Should I try donating to foreign militaries/insurance groups? Unethical cow/pig/sheep farms (a la cowschwitzs 💀), if we count the suffering of animals?

Given a relatively privileged position in a first world country, what is the most damage I could realistically do?

Sorry if I sound really edgy, but honestly I'm curious. Like, its probably cheaper to save a life than to end one, because avenues are already in place for the former and not for the latter.