Kobo is the answer. It used to require some finicking to get it so you didn’t have to sign up with Walmart, but now that’s supposedly no longer an issue (I’ve had my Kobo for a long time). Install Calibre and the Kobo extension for Calibre. You now can borrow epubs from your local library, purchase them from your favorite online ebook store, or sail the high seas if you don’t give a fuck.
Sorry to hear that. I’ll admit I don’t buy ebooks. Yoho yoho and all that. And yeah, I also never turn on wifi. Have you tried a hard reset?