Yay, this was my question!
I’m still figuring out my own book storage. I started reading comics less than two years ago with no idea that I’d buy so many of them, and no plan for storing them. My collection started on a shelf of my CD rack (it’s from Ikea, so the shelves move around and I repurposed the one shelf that was too tall for CDs or DVDs) and now has expanded to the only other available space I have right now — an awkward space on top of a small dresser, held between my actual bookcase and a makeshift bookend. (I have real bookends. I should use them.) I’m on a decluttering mission, though, so eventually I‘ll have a better space for them. I’m just really bad at decluttering when it comes to books.