My weaknesses include proofreading and archival research. I find it hard to maintain teaching energy from August to December or January to May. I often make minor mistakes on my syllabus, leaving out a day or scheduling class when there isn't supposed to be any. I am bad at event planning.
Sometimes I jump ahead of myself and develop my ideas intuitively, before I do my research, so my research is often playing catch-up to my writing. I still am not accurate at estimating how long things will take to do, despite my pretentions as a time-management guru. I am both too rigid with time and not rigid enough. In other words, I will sometimes impose rigid but useless scheduling rules for myself, but at the same time fail to follow more basic principles.
I am somewhat egotistical and conceited in some ways, but yet I find it difficult to do the necessary self-promotion. I can be peevish and ill-tempered. I am prone to sloth, envy, greed, pride, gluttony, lust, ire, and pride, not necessarily in that order.
Some of my research pursues issues of interest to almost nobody except myself. I don't know if that's a weakness or not. Self-absorption? I am a master at that.
That's only a partial list. The purpose of it is not to tear myself down, but to arrive at a realistic sense of weaknesses I can easily remedy and which are more intractable. Which of them are harmless foibles and which are keeping me back in more significant ways. There should be a third category too, of things that are neither strengths nor weaknesses, things that I can do just good enough, but that I don't really need to improve.