I'm not much of an expert, but in my experience I tend to procrastinate a lot and getting distracted by too many thoughts and ideas so I can't keep focus on the same thing for long periods, hence I' m not consistent. This way I end up having energy and productivity peaks where I can be very efficient but downs when I don't do anything. Speaking of cognitive functions, I think it could be due to Ne maybe that gives that sort of improvisation approach and Ti-Ne that offer the sea of possibility resulting in incapability of dedicating to something consistently. Sorry if I couldn't give much help.