You cannot stabilize Afghanistan any more than you can stability Shitcago.
You cannot fix Afghanistan, but you can stop the Taliban from taking the entire nation over. They already control a good portion of it.
With that said, I am done in Afghanistan. I lost friends there who were trying to rebuild a failed nation state because the diplomats, republicrats, UN, and contractors turned it into a giant slush fund of FAIL.
Yes, I am bitter.
World leaders since before Alexander the Great 2,300 years ago been trying to "fix" Afghanistan. The only thing that would ever pacify Afghanistan is to kill everyone there and replace the population.
Even if you replaced every Afghan he with an American, the mountainous terrain, the violence of neighboring tribes and countries, and God knows what else that might be in the water, would render these poor transplanted Americans into savages in a few generations. That isolated, mountainous area of the world is designed to create violent tribal societies.