This is the very best analysis of how to write subtext that I've ever read.
www.helpingwritersbecomeauthors.com/5-ingredients-need-story-subtext/

Another one from KM Weiland. She's on fire with this post about how to pick the right antagonist.
http://www.helpingwritersbecomeauthors.com/how-to-choose-the-right-antagonist/

Janice Hardy has a post on Anne R. Allen's blog about how to fix that unfinished novel. Good thoughts to help you analyze what wrong.
http://annerallen.com/finish-novel-fix...