Assad won thanks to these Shia militias:
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But after cease fire was achieved, they became confident. Iraqi, Afghani, Pakistani.. militias returned home (some were still stationed in Deir ez Zor and Palmyra). Hezbollah was pulled out during recent war with Israel. So Assad remained alone.
Fast fall of Aleppo was a devastating morale blow for Assad forces, they lost will to fight and Shia did not come to help.
As I said earlier what really puzzles me is why Iraqi Shia militias did not come for help. They still have ENERMOUS man power. But did
absolutely nothing and even pulled out their forces from Deir ez Zor and Palmyra without any fight.