After trying for 20 years to adjust a country's culture and power structure, we have failed.
IMHO, the pending fall of Afghanistan to the Taliban is not a testament to the US's lack of effort but a consequence of a dominantly homogeneous culture. This is a multi-millennial-old culture, yet it has made such little progress WRT human rights, technology and governance. I believe this inertia is driven by "tradition", which becomes entrenched when the culture is homogeneous.