After Raqqah, SDF has no real objetives against ISIS. One could say they can drive towards the besieged city of Deir ez-Zor, but for what?, to relieve it from ISIS or to relieve it from ISIS AND the SAA elements still holding on?.
I think the SDF will most likely concentrate on their next fight, against the Turks. I don't think the Turks will let the Kurds live "so easily" after all of this mess, Erdogan's face is red tomato when he sees that the Kurds are actually controlling territory now. But the US is in the middle of this as well, effectively supporting the SDF, the SAA is also in some sort of temporary alliance or cease fire with the Kurds but I don't think they'll be willing to fight the Turks after years of bleeding out in this pointless war.
ISIS has been defeated a looong time ago, when they lost momentum in both Syria and Iraq (they were more successful in Iraq than in Syria imo, with their elements almost reaching Baghdad itself), it was just a matter of time. Problem remains, another ISIS could emerge, if we don't kill the mother, she'll just keep having babies. And Saudi Arabia is not really a kind guy in this situation, I'm just saying.
Recent gains made by the SAA close to Raqqah, I wonder if this move poses any threat to the Battle of Raqqah, and how the US will kindly respond to Syrians moving inside their own borders...