Any other novels like Dying Inside by Robert Silverberg?
A novel where a protagonist has a superpower or some great ability like telepathy or high intelligence, but is slowly losing it over time and must adjust to their life without it. I find it a really fascinating idea, as most types of these novels are about people getting stronger, not weaker.
The only examples I can think of that is even somewhat close is Flowers for Algernon by Daniel Keyes and maybe Firestarter by Stephen King where Andy McGee's power gets worse over time and slowly kills him.
Thanks.