To align with Amazon’s Leadership Principles, the better choice here is:
“I sometimes focus too much on past mistakes”
→ Choose “More like me” or “Most like me”
Why:
Amazon prizes Customer Obsession, Ownership, and Deliver Results, all of which imply your career and performance are top priorities.
Saying career is not your top priority conflicts with those principles.
Acknowledging you reflect (even sometimes too much) on mistakes can align with Learn and Be Curious and Are Right, A Lot, if interpreted as self-improvement.
So choose the past mistakes side to better align with Amazon.