Here are 3 non-fiction suggestions:

1. Zen and the Art of Motorcycle Maintenance — Robert Pirsig. I read it in 1974 when I was in medical school.

2. The Power of Positive Thinking — Norman Vincent Peale. I read it when I was 14 years old in 1962 and it profoundly changed my life for the better. I wasn't "born again" nor did I become religious, rather it abruptly and completely changed for the better how I interacted with others.

3. Alive — Piers Paul Read. Published in 1974.