I've been trying to get so many people to read Southern Reach Trilogy. It's a fantastic slow burn that doesn't fill in too much and let's you think on it. I've actually gotten a friend to read House of Leaves before she's been willing to look at Southern Reach though. I have no idea what magic words I'm missing to sell it better.

Oh, also, if you enjoy House of Leaves you should check out Siderius Plug’s Immortality in Ninety-nine Endnotes I've heard good and similar things (though obviously much shorter and more hands on being a solo ttrpg). It's sitting on my stairs (where my books to read lay since wife filled our bookshelf) as my next "read".