Attack on Titan creator has no intention for sequel anime or manga

Hajime Isayama, the creator of anime series Attack on Titan, has commented that once the finale has been released, he won't be doing a follow-up

Is there is any chance that manga of AOT is going to continue after 139.5 chapter or a next part will come with another name? - Quora

10 Things Fans Want To Forget About Attack On Titan

Since the AOT manga is finished, will Hajime Isayama make a new manga? - Quora

Attack On Titan: 5 Reasons The Manga Should Continue (& 5 Why It Shouldn't)

Attack on Titan's series finale isn't supposed to feel good - Polygon

Attack on Titan The Final Season Part 2 (TV) - Anime News Network

Attack on Titan: How the Final Episode Sets Up a Sequel

Will there be a sequel to Attack on Titan?

Hajime Isayama - News - IMDb