Which reader do you have? I've been looking everywhere I can think of for a good 8-inch device, but I need it to run Android. Heck, I even tried looking into tablets with traditional screens and am having trouble turning up anything serviceable.
I have a 6" screen and it's too small. I got a 10.3" one and it was too large. But I'm starting to suspect those of us who primarily want to read are the only ones who want 8 inches, and we're a rare bread.
Viwoods AI Paper mini and Supernote Nomad if you want 8” Android. They’re primarily focused on the writing experience but they will run most Android apps and Koreader.
The downsides are that they are expensive and the Nomad does not have a front light.
Kobo Forma. Probably not easy to run Android on it.
I love my Forma. The only thing about it that makes me sad is the micro-USB port. I skipped the Sage because it was a side-grade (USB-C but worse battery), and now they've discontinued it with no clear future for the format.
I really hope they bring back a similar format ereader in the future, I don't really want to go back to a smaller scale device when this one dies.