I feel like i could be on the same route, my dry spells only been like 2-3 weeks but i know how you feel about motivation
Though i definetly wont lose it, im just teaching myself news ways to keep at it, its like learning a skill, you wanna come good at it, you practise, and come on now, going to sleep at night has got to be the easiest and most natural skill we allllll do, naturally!
My advice would be get the dream journal out! concentrate on lucidity but also on normal dreams! theyre just as fun most of the time, you could also get into dream interpretation, learn what your sub conscious is trying to tell you! it could even be hinting why your not having lucid dreams!