Eb, I find my titles in a few sources, so maybe it'll work for you, too.
First, I look within the text itself for the perfect short phrase. This is hit or miss, but my novel stalled on a not-good-enough query letter found its title this way. Ideally, the phrase will have two meanings, be insightful, address the theme, or serve some other lofty and/or dual function.
Second, I seek quotations about some aspect of the novel. If I'd written Black Beauty, for example, I'd seek quotes about horses, service to others, pulling a load, whips and other cruelty to animals, beauty, kindness, and such. Shakespeare, the Bible, and the Romantic poets usually come through when you use the right terms.
Last, if I just don't like my working title, I ask anybody who's critiqued a chapter or beta-read the whole if they've got any ideas for a better title. Often people are happy to brainstorm, especially face to face.
Maryn, hoping this helps