There is a lot of beautiful places that weren't accesible a few years ago and you can go and visit nowadays, war indirectly has protected those places but ironically there are people deforesting those places now, the government is also trying to access mining and oil resources which can put these places in danger. I hope the international community can start looking how we can preserve those forests and all the species that they have.
I fear the "international community" is more likely to be the one eager to exploit those forests.
Your best bet is with the indigenous people, assuming they haven't been already genocided or mestizoized.
There has been a dozen or so national parks in the Amazon that have been wholly abandoned due to FARC threats. War hasn't helped at all.
Silly gringo question: can foreigners buy the land and lock it up as preserve or something similar?
And that is how conservation is defeated.
Those forests belong to the Colombian people, and they indirectly decide what happens to them through the electoral system.