I assume that most people who have a Twitch monthly sub via an Amazon Prime subscription are already using that with their favourite streamers. But if you have the sub and you're not currently using it for any specific channel, you might want to consider supporting the Monterey Bay Aquarium's Twitch channel with it.
The channel frequently streams relaxing animal cams (like their jellyfish cam, or their sea otter cams, virtual birdwatching, etc.) And they also sometimes have talks by experts, so you can learn about the animals and their environment as well. During the pandemic the channel used to stream Animal Crossing with marine biologists talking about the fish you could catch, or insect biologists enthusiasing about in-game insects. That's when I started watching them.
The reason I think it's generally a good channel to support is that the aquarium does sound research and conservation work, and that includes their work rehabilitating wild sea otters.
I've been a subscriber that way for a number of years now. Even if I don't always watch the animal cams, it's nice to know that maybe my sub is being turned into sea otter food. 
