So these are my predictions of who is gonna die next week.
I feel like its super obvious that Ellaria Sand and the other sandsnake who is still alive will be given to Cersei and she will probably kill them right away. Then there is a chance that Yara dies but since they didnt kill her last episode i feel like she's safe for now.
The other death im expecting is Greyworm. So in the next episode he's gonna be leading the Unsullied to Casterly Rock for a huge battle. And based on how he left things off with Missandei and the sex scene. Also that i feel like his storyline doesn't have much else to go. I think that he's gonna sacrifice himself in the battle which the unsullied will end up winning.