The cancellation of 'Tell Me a Story' might be because of changes in the network's programming strategy or because it didn't fit with the overall brand and content direction they wanted to pursue.
It's hard to say exactly. Sometimes creative differences among the production team or changes in the network's programming strategy can lead to a cancellation. Maybe the storylines weren't evolving in a way that was deemed sustainable or popular enough.
It could be that the storylines became repetitive or the production costs were too high. Sometimes, changes in the network's programming strategy can also lead to cancellations.