When Percy Jackson & The Olympians: The Lightning Thief and its sequel, Percy Jackson: Sea of Monsters, were released to theaters in the early 2010s, fans of the Rick Riordan YA novels they were adapting had many complaints. But the chief one was something that comes up often when a book or book series is turned into a film: a movie just doesn't have enough room to adequately capture everything that made the book good. Riordan's books, involving the children of Greek gods, feature so much world-building that condensing all of that, plus the specifics of each of Percy's adventures, into two hours or less makes the whole thing a jumble.
"It should have been a TV show" is a phrase you hear a lot in these situations. Heck, Jodie Foster said a variation on this a few weeks ago regarding her old friend Martin Scorsese's Killers of the Flower Moon, which she felt was so focused on the murder plot(s) that it couldn't properly explore the rest of the story(*).
(*) For what it's worth, I'm with Foster on this one. Killers either should have been a miniseries that could incorporate more of the material from David Grann's book — particularly about the Osage community that white men like William King Hale preyed upon, or it should have been a much shorter movie that didn't keep hitting the same emotional beats over and over about Hale talking his nephew into killing Osage women.
But "just make it a TV show" isn't as simple as it sounds, even with the author of the books involved. The debut of the Percy Jackson and the Olympians on Disney+ two years ago excited the fans on multiple fronts. Riordan was actively involved as a producer, and co-wrote multiple episodes. The show depicted Percy and his friends as early adolescents, like they are in the books, as opposed to the very mature-looking late teens of the films. And an eight-episode season would, in theory, allow Riordan and his collaborators (including co-creator Jonathan E. Steinberg) to let the story breathe, and do justice to both the mythology and the characterization.