Obama fucked up on Afghanistan. The UN had been warning his administration that not only were the Taliban on the rise but that ISIS had taken over large swathes of land. At this point in time Trump should either go balls to the wall or get out entirely.
I think the proper course of action would be to get out and open all of Afghanistan to those trying to leave Obama's biggest error, Syria. Let them all stay in Muslim land. After all to listen to liberals Muslims are peace loving and they invented everything that makes life great.