Non fiction or fiction books

Non fiction or fiction books I’m wanting to get used to my own voice when speaking out loud, so I’m planning on reading a chapter or section of a book everyday. I’m not that interested in fiction books, and would instead rather read informational books on engineering, STEM, etc (I’m a uni student who really needs to get better at learning content lol). However I feel like fiction books would help me to understand emotion and tone in voice, not that I’m a robot or something, but more so that it’ll help in conversation scenarios.