What did you expect Assad to do in just a decade after having his country destroyed and isolated by sanctions that everyone still fears? magic?
Only Russia is helping Syria to a limited extent, while the US, Europe and Israel continue to arm radical Islamic terrorists with a mindset more backward than any medieval sultan to keep the Middle East in a state of constant war and penury.
Assad is a secular and rational leader, he is doing everything he can under the circumstances. Those who promote religious extremism are the West, arming fundamentalist tribes to weaken rational leaders.
It is also not appropriate to compare China's situation and its role in the Global South with the case of the Syrian war, since China does not participate in any military intervention in the world. China's role is still just commercial and avoiding sanctions and confrontations as much as possible, it has nothing to do with military actions.
There are many Western and Israeli weapons killing Syrians, Russians, Lebanese and Iranians but no Chinese weapons killing Westerners. It's hoping for magic to think that the Global South will get rid of Western bullying without direct help to balance the forces. So as long as China does not change its doctrine, we cannot expect results other than these. And apparently China is not yet ready to challenge the West in every military adventures around the world.