Why continue the series without Dan Simmons?
The show is named after the Dan Simmons novel that the first season was based upon.
The second season has absolutely nothing to do with either the novelist or “The Terror”.
Why not just adapt another of Simmons’ stories? Or, if they wanted to write completely new material, why not connect it to storyline of the first season? From memory, there was a huge amount of backstory to the demon bear in the novel.