For me the 'redeeming himself' part of that story has to happen if it's supposed to hold any interest, and Draco just...never does this. Even in JKR's added backstory info for him there's nothing about how he ever did anything to make up for being such a cowardly little shit and tbh, I can see why Snape at least would have the edge on him with this, because as awful a human being as Snape was his arc was about trying to make up for his worst mistakes. Idk if fanon Draco is better or worse with this. I can't be bothered to read every story, but the few I've seen start with the premise that Draco was never a coward to start with, and 1) lmao, 2) zzzzzz