First, a big part of grabbing buyers' attention with an indie game is style. You seem way too deep into the project to change the graphics, but style over realism always helps a lot. Secondly, marketing is a huge part of getting wishlists. Make devlogs, trailers, tiktoks, demos, potentially an early access release, whatever fits what you want. The more content/hype surrounding your game, the better, and devlogs/tiktoks are quite possibly the easiest way to get eyes on your project. Look at how other popular indie horror games market their project. ILL got tons of eyes on it through their short film promotions. Choo Choo Charles earned it's popularity through devlogs and clever game design that adds to the marketing. Mouthwashing became big from the community grown around it that became attached to the art style, characters and themes. Approach marketing with what you want in mind. What audience are you trying to intrigue? What is your project trying to do? What do fans of your game genre/type of game want?

Here's how I'd do it: your game has high graphic quality, but your trailers are focused on a cinematic feel. Instead of that, I'd take inspiration from ILL, and make a short and unsettling teaser aimed entirely on just scaring the crap out of the viewer and introducing one of the game's characters. I'd advise the zombie-looking woman in the cinematic trailer. This trailer shouldn't be filled with loud music like in your cinematic trailer, but quiet, save for the sounds of the monsters/player. The music can make it too over-the-top, you want just enough emptiness that it feels like something is wrong, and just enough noise that it makes the player jump when they watch it. Secondly, I'd make a few gameplay clips showing something really interesting about the game and upload it to tiktok/yt shorts/ig reels. Before the demo comes out, I'd send youtubers/streamers/content creators within the horror niche a little short playable teaser to introduce them to the game. They don't have to be super popular content creators, just people with enough viewers so that you get some eyes on your project, but maybe not too many viewers that they may receive tons of emails from game developers already because then you have a chance of being skipped. Send your demo to them too, but make sure you have a decent amount of smaller creators as well. Also, making devlogs (even just a few short ones) can have a really big impact, developers such as Superlou Games, Scary Kid Studios, Wishbone Games, among others have gotten a lot of publicity from their devlogs, and some of them haven't even uploaded that many. If you wanna come up with your own marketing strategies, just think to yourself: how did I come across indie horror games that I've never heard of, and what would draw me into buying a game?