Do you mean setting up a full-scale effort and coming like (as funny as it may sound) "alien overlords"? meaning, not aligned with anyone currently fighting, but with the ultimate goal of helping those caught in the crossfire, in any means deemed fit.
Well, I hesitate to say one size fits all, there are ranges of things - we've mostly just helped stop violence, we've set up some really bad governments (e.g., the Shah of Iran), and we've done some pretty creative things such as when we helped Japan move from an emperor-worshipping society to a democratic one that was very intensive and expensive (we also subsidized their economy to make them a competitor to China in Asia).
Thing is, we do something crappy sometimes and then people turn off to it.
We actually tried pretty hard in pre-war Vietnam, but couldn't do what was needed - we got stuck with a pretty hated and inflexible dictator who made his minority religion oppressive towards the majority for years, and just didn't really make the investment in creating a better system than what seemed like the general of the month approach that wasn't quality democracy in the middle of a war where we sort of fundamentally had made a wrong turn opposing the people's freedoms in the name of anti-communism.
It's not a bad analogy in ways to our current 'no good options' like Syria. We had the chance to make an ally of Ho Chi Minh for decades and who knows how that would have gone, but while he was a legitimate leader for freedom for his people we snubbed looking for an alliance earlier, he was also a murderous competitor for power in his country.
I don't recall much of any American who supported allying with him on behalf of the Vietnames people's freedoms by denying our support to France to re-colonize them after WWII (most Americans don't know the US paid up to 90% of French war costs for them while they occuied Vietnam) - that's 'just how things were done' and not supporting European colonization was a pretty big radical diplomatic shift for us I think mainly Kennedy made for the US.
We thought we were making a shining democracry on the hill with Vietnam - if that sounds familiar to things like our intentions in Iraq.
As citizens we ask, 'don't we know how to do this by now?' But most of our institutions have never been much about the interests of the people, more about how to establish control. Remember in the 1980s how we'd supply big groups of forces trained to torture and kidnap people like professors and labor leaders in Central America as our approach.
And yet 'look how well Japan turned out'. So it's complicated how to help effectively.
For example, Afghanistan is a pretty uneducated and fundamentalist country, it seems, where the wealth that is there is organized around warlords and corruption.
How do you fix that?