story plot ideas?

I got this idea from a book (my autobiography)

Murder mystery starting at the resolution o the mystery, where the butler is wrongly accused of the killings and has to defend himself in court

Bugs increase in population and size so much that 70% of Humanity dies, and every year mosquitoes rampage across the world sucking the blood of every animal and human it comes across.

Zombie virus spreads. The government becomes totalitarian in the process of trying to contain it because they have to regulate births, deaths and ill people much more. Story focuses on moribund person who is about to be euthanized for the sake of the virus not spreading.

An emperor has dies. So his apprentice (also his sucessor) and his wife attend his funeral in the forest of magic. After the funeral, his apprentice becomes the next emperor. The new emperor cursed because when the old emperor died, the new emperor didnt say goodbye and go home. The story focuses on the curse he had, the challenges of evilness in the empire, and the way to break the curse.

Anybody have.. any ideas? I’m suffering from extreme writer’s block. Any good fantasy/dystopian/murder mystery plot ideas? Anything will be appreciated x