I think this short story might be about a dead djinn in a cryo state. Maybe it explores the mystery behind the djinn's death and how the cryo element is related to it. It could also involve themes like magic, the afterlife, or the power of the djinn.
One common theme is exploration. Since Albedo is an alchemist, fanfics often have him exploring areas where cryo slimes are found to study them. Another theme is the relationship between Albedo and the cryo slime. It could be a scientific study - like relationship or sometimes a more emotional bond as Albedo discovers the sentience within the slime.
One possible theme could be loss. Even though the body is in cryo, the fact that the person is dead represents a loss, and the story might explore how different characters deal with that.
I'm not sure which specific 'a dead iin cryo short story' you are referring to. There could be many stories with such a title or concept. It might be about a character who is dead in a cryogenic state, perhaps exploring themes like the ethics of cryo - preservation, or the mystery behind the death in such a situation.
I'm not sure about a specific 'albedo cryo slime fanfic' off the top of my head, but you can check out fanfic platforms like Archive of Our Own. There are likely many stories there that involve Albedo and the cryo slime. You can search for relevant tags such as 'Albedo', 'Cryo Slime', and 'Fanfiction' to find some great reads.
Maybe the main plot is centered around the djinn's final wish before it died and how the cryo state is related to fulfilling or preventing that wish. For example, if the djinn's wish was to be frozen until a certain time, the story could be about the people or forces trying to keep it in that state or wake it up.