How Horror Has Changed

Horror stories have been around for a long time. Ghost stories in particular are enduring and are always popular, although many ideas have been done before. The sub genre was recently given a boost with the release of the popular Netflix show The Haunting of Hill House, an adaptation of Shirley Jackson's book. The show brought new elements like time shifts and the living being haunted by themselves! 
They say there are no new ideas and horror has to change with the times. There are new threats, technology is used so much more and you need dynamic characters to tell the story.
Adaptations are still popular as seen with Dracula on the BBC. The story took a different narrative angle, introduced a new character in Agatha Van Helsing and even brought the story into the modern day. 
It proves that there are a million ways to tell the same story and that if you can find a unique and different way to tell it, then you could have a hit.
If you are new to writing horror and you are struggling to think of an idea that hasn't been done before, don't fret. Your way hasn't been done before. Stories that worked 20-30 years ago, would not work today. Think about The Ring. Videotapes? A thing of the past, but the filmmakers found a way to bring it up to date with the reboot. Equally you could take a modern day story and set it in the past. 
Horror will always continue to evolve and as long as we evolve with it, we will continue to produce great stories.