Recommend me a cosmic horror book that will get me hooked

Long story short, I was in a reading slump and feeling lazy, so I started The King in Yellow and liked it.

I started searching online about cosmic horror, watching short films and documentaries, and now I’m looking for a book in the genre.

I’d love one involving something the human mind simply can’t comprehend, yet is still somehow close to us. Cosmic entities from space are fascinating, of course, but I think something familiar in nature, something that has always been here with us, would be cooler.

However, any reccomendation is welcome!