In my opinion, the United States (US) should never have gotten involved in Syria in the first place. The crisis in Syria started as a peaceful protest by Syrian’s citizens against a lack of freedom and economic problems caused by Assad's authoritarian rule. After several years the situation escalated as more extremist groups throughout the region got involved, including the Islamic State (ISIS).
The situation deteriorated with rebel groups not only fighting Syria’s military forces but also fighting each other because of religious differences. The US got involved in 2014 to support local militias fighting ISIS. Since fighting ISIS was the original priority of the US in Syria, the US should continue that priority and get out as quickly as it can.