Finding solid Jungkook x Reader stuff takes some navigation because quality gets buried under sheer volume. Archive of Our Own is my primary haunt—the tagging system is a lifesaver for filtering out the million coffee shop AUs to find what you actually want. You can sort by kudos or comments, which usually surfaces the well-written, emotionally nuanced pieces. I found this one slow-burn artist!reader fic there last year that still lives in my head; the characterization of Jungkook felt painfully real. The downside is that you need to know how to use the filters effectively, otherwise it’s a bit of a maze.
Tumblr still has pockets of amazing writers who post linkbacks to AO3 or use the platform itself. It’s less organized, but following specific writers’ blogs means you get their moodboards and little behind-the-scenes thoughts, which adds to the experience. The interaction feels more personal. Quotev surprises people, but some of the most classic, beloved JK x Reader fics from like 2017 are still archived there. The site’s interface is dated, but don’t sleep on it for those older, plot-heavy stories that everyone used to recommend. Wattpad has the most, obviously, but it’s a real mixed bag—you have to wade through a lot of poorly formatted, wish-fulfillment-heavy stuff to find gems, which can be exhausting.