If you were moved by David Selig's painful awareness of his diminishing telepathic power and the unraveling of his identity in Dying Inside, you'll find Flowers for Algernon equally affecting. Charlie Gordon's journey—from intellectual disability to genius and back—offers a deeply personal view of selfhood slipping away, with all the emotional resonance and psychological complexity you enjoyed.

If you appreciated the philosophical introspection in Dying Inside, especially as David questions the meaning of his abilities and existence, Solaris will captivate you. Through Kris Kelvin's encounters with the mysterious planet and his own manifested memories, Lem crafts a haunting exploration of what it means to know oneself—and the impossibility of truly understanding others.

If you were drawn to the intimate, gradual pacing and melancholic tone of Dying Inside, you'll likely be mesmerized by Never Let Me Go. Kathy's recollections and the subtle reveal of her world mirror David Selig's slow emotional descent, creating an atmosphere of quiet tragedy and reflection.

If you enjoyed being immersed in David Selig's troubled inner life through his first-person narration in Dying Inside, you'll appreciate Holden Caulfield's raw, confessional voice in The Catcher in the Rye. Both novels offer an unfiltered look into the protagonist's psyche as they grapple with loss, alienation, and the search for meaning.

If you found yourself fascinated by David Selig's morally complex choices and his internal battles in Dying Inside, you'll be drawn to Lionel Essrog in Motherless Brooklyn. Lionel's struggles with Tourette's Syndrome, his unconventional methods, and his ambiguous morality make for an absorbing, character-driven read.