Suggest me unique literary fiction with unreliable narrators and philosophical themes

I'm looking for literary fiction recommendations that feature unreliable narrators and explore deep philosophical themes. I want something that keeps me guessing about what's real and what's not, with prose that makes me think deeply about existence, morality, identity, and human nature.

Here's what I enjoy:

• Complex, intricately plotted narratives

• Narrators whose perspective we can't fully trust

• Exploration of philosophical questions

• Beautiful, thoughtful writing

• Stories that reveal meaning on multiple readings

• Psychological depth and character complexity

Books I've loved in this vein:

• The Stranger by Albert Camus

• Invisible Cities by Italo Calvino

• The Metamorphosis of Prime Intellect style philosophical exploration (but looking for more literary merit)

• House of Leaves by Mark Z. Danielewski

• Slaughterhouse-Five by Kurt Vonnegut

Books I've tried but didn't connect with:

• Infinite Jest too long and overwhelming

• Some overly experimental fiction that prioritizes form over substance

I'm open to any length or genre as long as it has literary merit and that philosophical/unreliable narrator element. It could be contemporary or classic, literary realism or more experimental. What hidden gems or lesser-known works would you recommend?

Thanks in advance!