I have come to realize over time that some ideas I have for screenplays (mostly, I don't have this level of retroactive assessment for short stories and novels... mostly because most story ideas I have lately I immediately default to thinking of them as screenplays ideas... something I need to work on... I need to keep writing short stories and novels... like Socrates said about writing effecting memory, if I don't practice those skills, they will atrophy) are one of the following: redundant (in that I already have a screenplay too similar to that story), not interesting to me anymore (meaning the muse has left me since I conceived the idea) or is not worth my time anymore (in that I have other, more pressing stories, that take priority over it).
I bring this up because three screenplay ideas that I conceived in a fit of inspiration... I am no longer excited to write.
The first is called Depths. It is about a lake monster in a small town in Missouri that may or may not be supernatural and has a personal tie to the main character (the town sheriff). I was inspired to write this script during an advanced sneak preview of the movie Antlers in late 2021. But with my scripts Flatdog (which I am currently pitching) and Dweller (which I really wrote just for fun), I think I have covered that ground already.
Then there is Grotesque (or Gruesome, I've oscillated between which title I like best). This is a serial killer horror film that borrows heavily (and it knows it) from Edgar Allan Poe. I wrote this outline in a huff when I caught the bug of outlining future screenplay ideas in accordance with Syd Fields's three-act structure. I look back on the outline now, I am just not sure there is enough there to fill 90 pages. And, if there is, I am unsure if I still have the passion for the project to write those 90 pages. To be fair, I had this idea ten years ago. A lot can happen in ten years.
Then there is a project I conceived last summer (when running my miles) called Ethos. It is a post-modern, subverted slasher movie that I was inspired to write by my love for In A Violent Nature (which I saw late at night in theaters during its run). I wrote out a page of notes (I guess it could be called a treatment), but, just since last summer, I have lost the passion for this project as well.
Now, I nearly deleted the file of notes I have for Ethos, but then I thought better of it.
My advice: never jettison ideas you've lost passion for. You may rekindle that passion at some point. Or you may take bits and pieces from that story (spare parts) and add it to another story.
Further advice: just realize that you don't have to fully realize (or "flesh out") all the ideas you have. Some of them can languish and remain unwritten if you don't have the passion or inspiration to give them life. Prioritize what you want to write, at that moment, and you will get infinitely better results.
That is my two cents for today.