Look, if you're just jumping into Draco fic, you're honestly spoiled for choice these days. I'd skip the giant mega-sites right off the bat unless you're ready to wade through a ton of rough drafts. I stumbled into this corner of fandom a few years back, and I still think 'Archive of Our Own' is the most welcoming spot. Their tagging and filtering system is a lifesaver. You can sort by 'Draco Malfoy-centric' and then filter by kudos or bookmarks to find the stuff the community already loves. It cuts out so much of the guesswork. There's also a lot of older, classic Drarry over on 'fanfiction.net' if you dig around, but the interface is clunkier.
Honestly, a solid shortcut is to find a few authors you like on AO3 and then check their bookmarks. That's how I found 'The Man Who Forgot' by Dolphin, which was my gateway into well-written, in-character Draco redemption arcs. The rec lists and collections on AO3 are gold, too. Avoid the pressure to start with the million-word epics; a good 20k-word one-shot can be a much better introduction to the character's appeal.