I totally quit painting and drawing for almost 15 years Wayne . I didn't start doing artwork again until about 6 or 7years ago. How I got out of my slump was I just started drawing what ever came into my head and I didn't really do any finished work it was mainly sketches and if they didn't turn out great it didn't matter .
Now I get inspiration from other peoples art , like yours for instance. You do amazing work and even in a slump or having art block you still do amazing stuff ,so just do some drawing a day even if it is just a sketch on a napkin your inspiration will come back .