Get an old Kindle. The news ones make it hard for you to connect to your computer. But even just a couple of years back you could plug in your Kindle to your computer through a USB and just drag and drop files. It only reads the proprietary .mobi format but Calibre, an excellent piece of software, will automatically convert .epub files to .mobi for you and it has a great algorithm.

Then all you gotta do is look up whatever you want on libgen and for the price of one kindle you can have a virtually infinite library of books.

I’ve actually had my first generation Kindle for about ~14 years now and my newer one for about ~3 years. I won’t ever buy a new one, but the ones from ~3 years ago are excellent pieces of hardware.

You just have to disconnect it from the internet and never turn on the wifi. If you do, Amazon will fuck with your settings and make your life difficult.