I have a stash of Eggplanes and simpler kits as 'slump busters'

I also figure that even if im not building, if im looking at forums, watching youtube clips, reading magazines etc about the hobby it keeps it central in ya mind.

Also going to the hobby store and getting a first hand look at kits, new and the completed ones they have on  display can often kickstart an idea that gets the motivation levels up.

And of course the local hobby club and talking with other addicts.