A lot of the momentum for that fandom was on Archive of Our Own, but not in the main 'Love, Victor' tag—it's in the wider 'Love, Simon' fandom tag, which includes the show. The best stuff is often buried under general 'Simonverse' tags or attached to older fics that got updated when the show aired.
One trick that worked for me was searching for the character dynamic, not the fandom name. Like, filtering for Victor Salazar & Benji Campbell, or even Mia Brooks & Victor, if you're into those complicated friendship arcs. The writers who dig into the messy family dynamics or the cultural identity stuff usually tag those themes specifically, so you can find them that way too.
Honestly, some of the most insightful takes I've read were cross-posted from Tumblr threads or linked in Discord servers that have since gone quiet. The ephemeral nature of fandom spaces makes finding the 'best' stuff a bit of an archeology project sometimes. I remember this one long-form fic that explored Victor's relationship with religion after the finale, and it had maybe twelve kudos because it was in a niche collection. Worth the dig, though.