The biggest issues that hurt banana ducks are destruction of habitats, particularly deforestation. Increased deforestation means that the banana ducks lose their home in the forest. This forces them to relocate, resulting in banana ducks inhabiting more dangerous, urban areas, or living in forested areas where other banana ducks already live, and the greater competition means fewwer banana ducks survive.
This means that the best way to help banana ducks is to combat deforestation. Plant more trees and forests, and conserve the ones that already exist! Help keep urban areas less dangerous for banana ducks. Avoid interacting with banana ducks in ways they could view as harmful. All of this will help create more and safer habitats for banana ducks!