Troubleshooting Paperwhite frozen while reading

Hi. I was reading a sideloaded book when it suddenly froze. I tried doing the 6 to 8 sec reset but all that happens is that the light blinks for a bit then nothing. 40 sec reset also doesn't do anything.

Just a background, it drained last night and I was able to fully charge it today. I even got to finish a book before starting on this new sideloaded book when it froze. I'm thinking it's possible that this book I'm reading when it froze was a buggy one.

Amazon isn't helpful and they're just trying to sell me another one. Can I still fix this? It's currently plugged in to my Macbook since I've read somewhere to leave it plugged in this way for more than an hour. I already tried plugging it in to a power outlet for a few minutes but the 40 sec restart didn't happen.