I want a novel where the main character is just quietly competent without being a hero or a mess

I am tired of reading about chosen ones, tortured geniuses, or people who can barely function. I want someone who shows up on time, knows their job, solves problems calmly, and goes home at five. No drinking problem. No tragic backstory. No world ending stakes. A mechanic who fixes engines well. A librarian who alphabetizes [...]