For me, it's probably perfectionism. I've worked on it a lot in recent years, but I still notice perfectionist tendencies creeping up when I'm working on various projects. I've met quite a few other INFJs online recently and know that most of us (especially women) deal with perfectionism, or have at some point in our lives.
I love learning about the similarities (and differences!) between INFJs, so I'm curious what you'd say is the one issue related to your INFJ personality that you'd most like to solve.
I'd love to hear your thoughts!