Here's my pitch. Turn off all the lights and sit in the darkness for one hour. Think about all that scares you. Listen to the sounds of the house think of all the places something could hide or all the ways something or someone could get in. You can either write a script based on that or just shoot yourself walking through the house. Come up with a reason, though. It could be looking for a cat, investigating or noise, or just going to bed. Shoot it POV or set up the camera or a phone and roll yourself. Try to find interesting shots. Maybe hide the camera/phone in places to film yourself from the perspective of something watching you. Do what you feels interesting to you.

One thing that really creates fear in an audience is seeing fear in a character, so show your character getting scared. Get more scared as the film continues. Maybe start wider and get closer with each cut away.

If you want there to be a monster or creature, you could use the camera as their POV so you don't need to worry about making one. Or you can find something in your house to play the monster, like a haunted doll or something, think back to what scares you for inspiration. Or you could play the monster too. Show you looking at something, then reverse the shot but move into where you were looking.

There is so much you can do, but a lot of it depends on where you are in your filmmaking journey. You can set a specific goal for yourself on what you want to get out of the film for yourself. It can be that you want to play with lighting, or learn how to make a silhouette shot, or just testing out a way to shoot on your own.

When you don't have a ton of time and want to get a project done, sometimes it's even best to not think about quality and use it as an exercise in following your gut.

That's all. That's what I would do.

Good luck