Status for season 3
The series is NOT renewed for a new season. It has been cancelled and there will not be a season 3
Spiritpact Season 3 was cancelled following a conflict between the director of the show Li Haoling and the author of the original comics Pingzi.
Pingzi was not too happy about the fact that the director decided to alter the anime story and the collaboration between the two failed. But the good news is that the Chinese comics are still ongoing with 5 seasons planned. So even if Spiritpact Season 3 is not happening on TV, you can read the comics instead to keep up with the story.
The Chinese comics, alternatively known as web manhua, are published on Tencent. The problem, however, is that the chapters are published in Chinese. But with a little research about Spiritpact (Ling Qi), you can come across English translations too. There's also a group on discord dedicated to the manga's translation.
This Chinese web manhua is an animated TV show streamed by Crunchyroll outside of Asia. It features a story about an unsuccessful heir of Exorcists who is killed in a car accident. After his death, he returns as a ghost and forms a pack with Tanmoku Ki pledging to fight the Evil Spirits.