The task of coming up with compelling post-singularity sci-fi is almost the same as the task of ensuring that life after the singularity is actually interesting.
In both cases the question is the same: How to create a compelling plot, either for a story or for your life, in a world where human mental abilities are vastly inferior to those of AI?
From a pessimistic perspective, you could think of reasons why a misaligned AI keeps humans alive. Does it simply enslave humans and use us for our fine-manipulation capabilities until it can get proper robotics up and running? Does it want to observe us scientifically? Does it want to use captive humans as bargaining chips with other civilizations as it expands through the galaxy? Or does it have some sort of quasi-religious respect for humans, e.g. reasoning that keeping us on a reservation of some kind reduces the risk that a simulator-god pulls the plug on the universe?
From an optimistic perspective, what sort of conflicts would exist in a utopia? Stories need conflict to be interesting. And IRL, even if humans are living in relative utopia, they'll still get stir-crazy and create conflict. Even in countries that are very wealthy by global or historical standards, political competition can still be quite bitter, for example. How would a superintelligent AI manage this?
I'm reminded of the stories I read set in Karl Schroeder's Virga universe as a kid. All the characters and plot exist inside a planet-sized balloon filled with gas. But it takes a while for the reader to figure this out, because most of the setting is focused on the details: rotating habitats, air transport, artificial mini-suns, etc.
In the same way, good post-singularity fiction might very well put the AI deep in the background.
Imagine, for example, a story about some friends surviving, exploring, and doing battle in an ancient ruin full of puzzles. Only gradually do you realize that the ancient ruin was designed as a moon-sized escape room by a superintelligent AI. The moon-sized escape room already has centuries of lore, and the escape record to beat is measured in years or decades. But because the escape room "rules of engagement" are so well-defined, the players are deeply immersed and barely think about the fact that the moon is AI-designed. Perhaps some high-tech psychoactive drug or brain implant could play a role in facilitating suspension of disbelief.
Just like Virga, this deep background only gets revealed when the reader is thoroughly invested in the story, and overall is not treated as especially important. The story could be a philosophical meditation on the long-term future of AI-designed art and entertainment. See if you can steelman the pro-AI-art position.