Recommend me books more psychologically complex or riveting than brothers karamazov and crime and punishment

I've read both Crime and Punishment and The Brothers Karamazov (in pretty good translations), and while I loved the intense moral/psychological torment, the deep dives into guilt, faith, free will, and human nature… I'm now craving something that goes even further in terms of psychological complexity, inner turmoil, unreliable narration, fragmented minds, or just straight-up riveting mental/emotional intensity.

Dostoevsky is often seen as one of the peaks of psychological fiction, so I'm looking for novels (classic or modern) that people think match or surpass him in depth/complexity/riveting power. Could be denser philosophy wrapped in character psychology, more experimental styles, darker/abnormal mental states, or multi-layered unreliable perspectives.

Some examples I've seen mentioned in passing but haven't read yet: Proust, Musil's Man Without Qualities, Thomas Mann's The Magic Mountain, Henry James, or even stuff like Kafka/Bernhard/Céline for sheer psychological pressure.

What would you recommend that feels like a step up (or sideways) in psychological richness/intensity? No wrong answers—classics, modern literary fiction, whatever fits.

Thanks in advance!