What if you break down the learning process a bit and focus on developing a set of habits progressively over time? This is also my 2nd time getting back into lucid dreaming, though the problem for me was not a lack of motivation, but a problem with doing too many things at once. Looking back at the first time I tried lucid dreaming, I remember I wanted to try out every possible technique that was out there since day one that will bring me closer to my goal faster. The issue was that I never actually sustained practice for more than a week or two at best because my mind will soon resist the attempt at change and laziness will kick in.

Now that I look at it from a fresh knew perspective I know better than to commit the same mistake twice. So, now I decided I should ease in the lucid dreaming practice a step at a time. Let the mind get used to the idea behind lucid dreaming slowly. Soon I will find myself closer to my goal than ever before.

Also, if what you did in the past didn't work for you then by all means change the practice method and use another one. Not all methods click for everybody, that also took me some time to learn.