honestly. A lot of the classic stuff is still scattered on old, semi-abandoned LiveJournal communities, which is a real pain to navigate. Your most reliable spot right now is definitely Archive of Our Own. The tagging system is a lifesaver, especially for a fandom with such a defined core pairing like Veronica and Logan. You can filter by kudos or comments to find the real crowd-pleasers. There's still a decent amount of new stuff popping up, mostly focusing on post-movie 'fix-its' or alternative season 4 scenarios.
For the really deep-cut, character-study focused stories, though, I sometimes have better luck on specific Dreamwidth journals or even older FanFiction.net archives. The quality there can be wildly inconsistent, but some of the most insightful takes on Veronica's psychology or her dynamic with Keith were written during the show's original run, and they haven't all been ported over. I'd recommend searching for authors who were active on the 'vmars' or 'marsinvestigations' communities. A surprising number of them have AO3 accounts now and have cross-posted their old work.
Just be prepared that a lot of the links in old rec lists are dead. The fandom's been around for nearly twenty years, so there's a lot of digital drift. Sometimes you find a real gem in a Geocities-era archive that someone saved, but it's a proper treasure hunt. Honestly, half my reading these days comes from following a good author I find on AO3 and then diving into their bookmarks.