I have many limiters; I think just racing more will work a lot of them out.
But, I’d have to say that having the confidence/aggressiveness to go with an early break or start my own is my weakness. I tend to wait and conserve which is great most of the time but to know when to go and do it, well that is my weakness. I have been working on this during the Saturday hammerfest focusing on getting the “city-line” sprints. Some days I get it by going really early, other times, I have waited and it worked out. There is some subtlety in reading the peloton and I may be gaining insight here.