Is there any kind of cultural production, any genre that you like a lot more than most people? Because if there is there’s someone who likes it 100 times more than you and has made a list of the top 100 things in it. If you haven’t gone through multiple of these lists then you you’re not even trying to get through the enormous amount of fantastic content out there that is wildly disproportionately likely to be great, for you.
You underestimate how specific people's tastes can be. There are nano niches. For example what if I like the music of a person so much that I'd rather listen to that person for 100 hours than to anything else? Well, that's exactly what I'm doing but when the author has only ever published 12 songs each 3 min long then that means I've heard the songs over a hundred times already and unfortunately at some point I just get bored of a song. I wish I could enjoy them longer but for me it would be just as good if the same author released a new batch of songs.
You no longer enjoy that person’s music so much that you would rather listen to it than do anything else. It seems unlikely that all of your interests are so specific. If you have some more general tastes there will be lists of good stuff you should check out in those genres. If you love these 12 songs more than acting else but have listened to them so much that all joy has drained from them have you listened to songs others with taste recommend for those who love these songs?
Artistic taste is far from infinitely malleable but it’s flexible enough for many to appreciate metal, opera, pop and classical music. If your tastes are so narrow and specific you are in a tiny minority.
I understand the enjoyment of collecting stuff or completing lists compiled by other people, but that isn't connected to what I enjoy about art, so I'm still not finding this a fun suggestion.
If you've listened to some Bach (for example) and didn't like it, why would you spend 200 hours listening to the rest?