Why should American bother?
They should never have been there in the first place. They should have quietly killed or captured Osama and ended the GWOT.
If they were serious about the GWOT, they would not have toppled regimes in North Africa, helped create ISIS, create the Syrian crisis and many many more instances where US administration was in a direct conflict with its own policies which resulted in deaths of American soldiers.
Did US forces and its coalition partners have a mandate in Iraq or Afghanistan? No. Bomb them sky high, then rebuild and try to win trust. Then arm one group, arm another and quietly leave the country.
How can you bring peace to Afghanistan when the most primitive, bloodthirsty tribe of Pashtuns is split between two countries, Pakistan and Afghanistan?
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There is little hope for the region as long as Pakistan has some leverage over Pashtun groups, Taliban in particular.