If not, then it's okay. Or else, justify it in the comments what it needs to improve its series.
What if the anime series go like this:
A). Season 3 covers:
Agatha Prophecy Arc (Volume 7)
Father of the Demon King Arc (Volume 8)
B). Season 4 (In split cours) covers:
- Cour 1:
Demon Castle Depths Arc (Volume 9)
Firmament of the Gods Arc (Volume 10, Act 1 and Act 2)
- Cour 2:
Sacred Silverwater Sea Arc (Volume 11)
Ruinous Abyss World Arc (Volume 12, Act 1 and Act 2)
Holy Sword World Arc (Volume 13, Act 1 and Act 2)
(That if the studio and the director are agreed in the future)
What do you think? 🙂