You will have a higher chance to LD if you have dreams in the back of your head all day. When I code I have code in the back of my head all day. Same goes for when I play games, study, socialize etc. So what kind of activity could have this effect but with dreams?
DJ'ing, dream interpreting and looking for dream signs in the DJ have had some effects for me. But only dream interpreting is close to being fun for me.
What are ways you have tried?
For me, reading (and answering) threads on this forum, reading old dream journal entries, frequently stopping to ask myself what I would do if I suddenly realized I was dreaming right now, and thinking about my LD goals and imagining what I could do in my next LDs are all fun and motivating.
I've started watching programs that could help with LDing like Adventure Time
What's always renews my interest in lucid dreaming after a long bit of time away from the practice is the impossible amount of things I can do.
Each time i return to LDing, I create a new set of goals and a large objective I intend to complete near the end of my 'expedition' as I call them.
This time, however, my overall goal is COMPLETELY different from my previous ones. I am currently incubating a sort of persistent realm I can return to in my dreams. Every day I am coming up with new characters, locations, and objectives to add to this universe, which so far has been working pretty well. Having such an exciting objective helps me direct my intention, a vital ability to lucid dreaming that really isn't emphasized upon too often. It's really awesome, you should try it sometime.
I made a thread about it here:
http://www.dreamviews.com/general-lu...-dreaming.html