Do your friends read more on social media or buy physical books? I'm asking because the reality is that the genre is so fragmented that what blows up on BookTok might not be the same as what sells in traditional bookstores.
What I'm telling you is don't just trust old bestseller lists or outdated rankings. The fantasy market in 2026 moves a lot through specific communities: some people are obsessed with romantasy, others with grimdark, others still rereading classics. If you want to know what's actually trending, jump into spaces where readers talk in real time: Goodreads has trending pages, Reddit communities like r/Fantasy, and of course BookTok is still a goldmine of information even if it's chaotic. Digital reading platforms also have "bestselling this month" filters that give you a pretty direct idea.
The important thing is to ask your friends exactly what authors or titles they mention most, because sometimes "it's trendy" means very different things. One person talks about Brandon Sanderson getting reprinted, another about a new indie author who exploded online. There's no single answer right now, unfortunately.