My dream is that Apple will release a mini every 3 or 4 years just for me. I currently have a 13 mini too, and I reckon a 16 mini would be perfect.

Otherwise I might end up with an Asus Zenfone, even though it is bigger than a mini.

Everyone loves audiobookshelf, but since you mentioned Plex, I thought I'd let you know that you can use Plex to host your audiobooks too.

Here's a guide:

https://github.com/seanap/Plex-Audiobook-Guide

I use Prologue for IOS to listen to them.