Sometimes authors need distance to do the story justice, but honestly, a year between books is not uncommon. It is pretty standard, especially in traditional publishing. Sometimes, if you are traditionally published, the publisher actually prevents the final book from releasing, then they have the rights to that book, and until they revert back to you, you cannot publish that book.
I’m not sure if you’re asking this because Chaos will release in Fall of 2022, but I can give an explanation for my situation.
I need to write A Game of Retribution (Dec 2021) and A Game of Gods (Spring 2022) before Chaos so I can write duel POV for Chaos and do the story justice.
I will also write a book called King of Battle and Blood (Oct 2021) in the meantime, but this does not alter my planned publication time.
Some self-published authors can churn out books within a month. I cannot. It takes me 4-6 months to write a book. After that, I have to edit. It’s just a process to ensure I release a good book.
I hope this helps!