Sometimes taking a break really does help. How about for the next week, put lucid dreaming totally out of your head. Focus on anything else, games, books, whatever interests you.

I've found on occasion when I am in a long spell that it's just when I've given up hope of ever being lucid again that I will have one.

Let's see, it's July 19th, post back on the 26th with how it went. Good luck!