You forget to mention that the US is illegally occupying eastern Syrian and stealing its oil. Trump openly bragged about this while he was president. As for Turkey, it is also illegally occupying large stretches of northern Syria with no mandate apart from brute force to do this.
Let's be clear Isis and Al-Qaeda were funded by the Gulf dictatorships, Turkey and the CIA.
When the SAA threatened to take control of Idlib the US/EU/Turkey all screamed about this saying how dare Assad take control of his own territory and that he was going to massacre local people blah blah blah. So the western world stands by and does nothing while Al Qaeda, aka Hayat Tarrir Al Sham is able to terrorize the population of Id Lib province along with assorted head chopping militias supported by Turkey and the West and no one gives damn.
Meanwhile, the US/EU maintain a punishing blockade on Syria preventing reconstruction of the country and the importation of medicines.
The Kurdish leadership who are proxies for the agenda of the US, which is de facto partition of Syria, are facing a rebellion from various muslim tribes in eastern Syria. This has led to bloody fighting between the two in recent months.
Love or hate him Assad is recognized by most countries on this planet as the legitimate ruler of Syria.
The alternative to him is a Heinz 57 variety of sectarian head chopping sunni militias and Kurdish oppression.