First off, I'd suggest that if you haven't already you finish writing the novel. This makes it much easier to decide on an appropriate title because you already know everything that you could relate it to. I try not to give too much away in the title. See if you can relate it to a key point in the novel, but perhaps the meaning can only be realised when you are half way through reading. My current novel 'The Dream Catcher' has a double meaning. I love using these as they can be fun to play around with and the reader doesn't see it until it's too late. Alternatively, you could name the story after your protagonist like JK Rowling did with the Harry Potter series or name it after an important object such as 'The Subtle Knife' by Phillip Pullman. I hope this has helped somewhat. Good luck!
