Yeah just like Demon said this happens every season. Nobody knew or cared about Made in Abyss in Summer 2017 and they were all excited about Kakegurui, but since it was licensed by Netflix nobody was able to watch it immediately, so everyone instead became hyped about Classroom of the Elite and Fate/Apocrypha, along with My Hero Academia Season 2 of course.
But then word of mouth started spreading slowly and slowly and Made in Abyss became an extremely popular anime of that season due to its sheer high quality.