One possible plot development could be that Sakura's tears somehow give her a newfound strength or resolve. Maybe she decides to train harder to protect Naruto in the future. For example, she could seek out a powerful teacher or a hidden jutsu to become stronger.
Sakura would likely be devastated. She has always cared for Naruto, even if her feelings have been complex at times. Her crying shows the depth of her fear of losing him. It could make her feel guilty for not being strong enough to protect him.
Definitely Naruto. He's always been there for Sakura, no matter what. He would use his Nine - Tails chakra if he had to in order to save her. Sakura's female friends like Ino could also play a role in her rescue. Ino is a skilled ninja in her own right and has a deep friendship with Sakura. And don't forget Tsunade. As the Fifth Hokage and Sakura's mentor in the medical field, she would do everything she could to save Sakura's life.
One common plot could be a battle where Sakura is severely outnumbered. For example, she might be facing a horde of powerful enemies alone while her comrades are occupied elsewhere. Another plot could involve a dangerous experiment gone wrong. Maybe she was trying to develop a new medical jutsu but something in the process backfired and put her life in jeopardy. Also, it could be a situation where she sacrifices herself to protect someone she loves, like Naruto or Sasuke, and almost dies in the process.
Well, I'm not sure about a single highly recommended one. But in general, in these fanfictions, Naruto's death for Sakura can lead to many different plot developments. It could make Sakura stronger, or it could drive a wedge between her and other characters who might blame her in some way for Naruto's sacrifice.
Common themes are love, loss, and growth. The love Naruto has for Sakura is central. His death brings a great loss to Sakura and the whole Naruto world. But out of this loss, Sakura may grow as a character. She might become more independent, learning to face challenges without Naruto's help. This type of fanfiction often delves deep into these emotional themes, exploring how the characters are affected in complex ways.
Naruto could try to talk her out of it. He is a firm believer in the power of friendship and words. So, he would likely use his words to try and break whatever spell or wrong idea is in Sakura's head that made her want to kill him.
Naruto might also try to remember Sakura in a positive way. He would cherish the memories they had together. He could start initiatives in the village in her name, like promoting medical ninja training more, since Sakura was a great medical ninja. He would slowly turn his grief into a force for good in the village.
One possible reason could be that she sacrifices herself to save Naruto from a powerful enemy. In the heat of battle, she might put herself in harm's way to ensure Naruto's survival.
It could be due to a dark influence. Suppose she was under the influence of some dark magic or an evil force that made her lose her true self and turned her against Naruto. This could lead to her almost killing him in the fanfiction.