I have been beating my head against this question for almost a year.
If I cannot do this well enough I should stop trying. So... am I doing this well enough? Once I finish the Eclipse Court and other series I'm committed to... should I keep trying?
Art is not left unfinished, it is only abandoned. If you don't tell your story - nobody else can. Great works are not determined by You or your Contemporaries, but by those who come afterward. The two penny lecture about the arrogance of quitting.