From my experience people tend to have very negative prejudices towards socialism. Therefore if you are trying to convert people, you should avoid being overt about it.
For example my first method is to simply rename terms, if possible according to the world you're writing in. Show socialist concepts as they are in practice, without using any specific term.
For added effect you should portray capitalist media, or whatever is their equivalent in your world, as constantly waging a propaganda war against your socialist movement. Show how they distord terms to the point that no one knows what they're talking about, and how that constant barrage of misinformation renders people unknowing of what socialism truly worked in practice. (I'm precising that last point because many leftists understand theory and all that, but are completely incapable of brushing aside capitalist propaganda when it comes to AES.)
You should also explain why those medias have an incentive to behave in such a way, that's it's not just a few bad apples.
Another way to do it is to focus on the thought process necessary to become a ML. Fight against the great man of history myth. Oppose idealism and put forth materialism to explain why your world works as it does. Reiterate my earlier point about the medias.
Some works are very hard to de-great-man-ise, and I honestly don't have a good idea on how to deal with those. Those aren't really my kind of fiction anyway, I prefer when there is larger world beyond the protagonist(s).-
That's all I can think of right now, but I hope this still helped you.