Hello, Cat
First of all, my condolences that the algorithms weren't kind to you. Many developers of truly great H-games have been struggling with this problem, especially since a certain, obvious events...
What I can say that definitely works on itchio is cross-promotion reviews. I often see the creator of one bigger game recommend another game that's a stupid AI-slope, and suddenly the slop achieve some insane results just because they were cross-promoting with a bigger fish. - definitely a topic worth exploring.
Secondly, as a commenter below pointed out, the way your game is visible on the Feed; Reporting your work more frequently will make your game's posts more visible - sometimes it's that simple! :D
Oh, and I think when Mr. Zakarnes spoke about images, he meant the images in the update posts and banners (Things that are visible first look), not the images on the game's store page itself. -Of course, if you post something spicy, people will be more willing to look at it :> Dry wall of text ain't sexy!
You can also try a market that's particularly receptive to H-games - Japan! Sites like Ci-en and Fantia can generate quite a hefty numbers.
-Every new platform means new potential audiences as long as you have something to show them.
I'm really fascinated by your game and have been following it anonymously for as long as I can remember. You're doing a fantastic job and deserve a success; Keep up the good work. I wish you the best of luck, mate!