Suggest me some books like A Short Stay in Hell by Steven L. Peck.

I’m drawn to stories about isolation, cosmic indifference, and what happens to the human mind when it is forced to confront forever. Books that make you sit with uncomfortable questions about meaning, faith, existence, and the scale of everything. I love that blend of speculative fiction and philosophy, where the setting is simple but the ideas are enormous. Basically, I want something that leaves me staring at the wall afterward, questioning reality a little.