Yes, you should. The Pandora Hearts light novel is a great addition to the Pandora Hearts universe. It delves deeper into the story, characters, and the complex world that was created in the original manga and anime. The writing is engaging and it can offer new perspectives and details that you might have missed in other forms of the story.
Another place could be FanFiction.net. However, the quality and content can vary greatly. It's important to read the tags and summaries carefully to find the ones that focus on the relationship between Alice and Break in Pandora Hearts. Some fanfics might be more centered around action or other aspects of the story, so you need to be a bit picky.
The Pandora Hearts Cacus Race Novel is set in the Pandora Hearts world which is known for its intricate lore and complex characters. It could potentially follow the story of the Cacus Race, which might be a distinct group within this universe. There might be a protagonist from this race who embarks on a journey to discover their place in the world, or to uncover some long - held secrets. There could also be conflicts between the Cacus Race and other groups in the Pandora Hearts world, and the plot might revolve around how these conflicts are resolved, all while delving deeper into the overall mystery and magic that pervades the Pandora Hearts setting.
I think it's worth a shot. The Pandora Hearts light novel offers an immersive experience with its engaging plot and vivid descriptions. However, it might not be everyone's cup of tea, depending on your reading preferences.