In general, increasing GDP per capita has all sorts of positive second and third order effects on net, likely improving the collective welfare of society.

It's a bit far removed from what you might envision as "doing good" though. It's a bit too abstract to feel on an emotional level.

And true, not all acts are equal. The emotional valence of improving ad rates for Meta can't really be compared to saving a child from cancer on a moral scale that most humans intuitively understand. Nor would I demand that you try to do so.

I often find that "making the world a better place" is synonymous with "looking for meaning in my own life".

Having children is usually a good start, if you don't have any already. Making the world a better place for them does wonders for the soul.

Or so I've been told.

Alternatively, if neither children nor economics appeals to you, you can always just donate money to St. Jude's Hospital or another charity. The money you earn would then make the world a better place in a way you can directly feel.