I haven't heard anything definite. Maybe there's a chance, but it could also be that the story has reached a natural conclusion. We'll have to keep an eye out for official announcements.
I have no definite information on when Bleach manga will return. You might want to keep an eye on official announcements or manga-related news sources for the latest updates.
The reason might be that the comic has a very conclusive ending that doesn't leave much room for further speculation or revisiting. Or, it could be that new comics have come along that overshadow it and make us less inclined to look back.
One important element is the plot. It should be engaging and make sense within the context of both Sado's world and the Bleach world. Another is the relationships. How Sado forms new relationships or modifies existing ones with characters from Bleach. For instance, his interactions with Ichigo or Rukia. And of course, the world - building. The author needs to create a seamless crossover world that feels like a natural extension of both universes. This can involve things like how Sado fits into the different realms of the Bleach world like Soul Society or Hueco Mundo.
In addition, the writing style matters. A vivid and engaging writing style can make the fanfiction really stand out. If the author can describe the battles, the Soul Society, and the characters' emotions in a detailed and exciting way, it will be much more enjoyable. For instance, when Kon is in a fight, the description of his moves and his thoughts during the fight can add a lot of depth to the story.
Characterization is key. The fanfic should stay true to the original personalities of the characters from both series. If Natsu from Fairy Tail acts out of character in the Bleach world, it can be a bit off - putting. Also, a good plot that takes advantage of the unique elements of both universes is important.