Socialism does not work. Any type of Socialism.
As for “democratic Socialism” — it has even less chance to succeed. The problem is with people —most of them don’t want to be “good Socialists” (even those who, because of their own stupidity, supported it). So at some point Socialism comes to having one of two choices — to die, or to start killing people.
It is not surprising that many Socialist countries had “democratic” in their names. Socialist support democracy only for as long as it helps them. When they come to power the first thing they do is to get rid of democracy.