50% books maximum compression 25% music 128kb or maybe 96kb 25% video, cartoons compress the best, very low quality audio, very low resolution, very low framerate. Probably my favorite episodes from Futurama, Bluey.
I'd rather have loads of shitty quality content than a few choice pristine copies of high quality stuff.
I might also consider reducing each of those by half and including One of the smaller 250-500mb LLM and have it draft out ideas for stories and sit around writing code to make it generate content.