Story ideas that aren't going anywhere

An incomplete list of ideas and hooks, both old and new, that I just can't seem to make into anything.

• Swarm of drones rescue someone lost at sea, told from the point of view of one drone (inspired by this skeet)
• A pair of black shoes are found abandoned by the cemetery gates
• "The Reality Generator is malfunctioning."
• A person has several lives of very different people in very different universes that they switch between whenever they fall asleep.
• Middle aged man struggles to cope in the aftermath of his wife's sudden death (a screenplay for some reason)
• Boy finds a hidden staircase in his grandparents' attic that takes him to an infinitely large library filled with fantastical residents
• PhD student recovering from breakdown house sits for their uncle, various magical things happen (like a doll that makes wishes come true)
• Former teen superheroes try to find a place in society, then aliens invade
• A sister tried to look after her younger brother in the aftermath of a war where society has pretty much collapsed
• Twenty-something spends weekend at sprawling family estate with highly dysfunctional family and tries to rescue his niece
• Werewolves running society so they can keep humans under control, small pockets of resistance try and fight back

The last one is probably the furthest along (19478 words!) but hasn't been touched in years. Some of these I'd forgotten all about until I delved into the files. There are other snippets of writing that I don't  remember doing and have no idea what the intent was. As an example, one file named "vampire" contains only the following: 

                The sun was still an hour or so from setting and the air was starting to get cool. I had time to kill before meeting my parents for dinner and was feeling restless. I just started walking, trying to stick to the side streets away from the crowds.

I'm guessing the person meets a vampire? Is a vampire? Who knows.

I start way, way more stories than I finish, and my inability to plan may be to blame. But if I outline a plot I know where the story is going and it becomes 100% less interesting to me immediately. I think that's why I love GMing so much instead - I can have ideas about what's going on in the world, set up a cool scenario, but what actually happens isn't all down to me and often ends up going in directions I would never have thought of. My players do the writing for me.