You'll have one tonight. That should be your mindset.

When something isn't working for a couple of weeks, it's time to try something different. If you're not doing it already I recommend adding MILD to your lucid induction practice. (MILD Tutorial - Lucid Dreaming - Dream Views) It can take a lot of time to build enough in-dream awareness to lucid dream with just ADA and reality checks alone. Using the power of intention using MILD can give you results a lot quicker.

I started inducing LDs when I found that MILD works well for me.