And the novel moves along, slow and steady.

The New and Improved, Steampunk Wordcount-O-Meter stands at 22,000 words. I've made my peace with my pace.
Though not with my tendency to alliteration...
Charles posted on writers who destroyed themselves when they felt their best work was behind them. The examples he used were vivid: Hemingway, Howard and London, two suicides and one who drank himself to death.
Truth is, Charles barely skimmed the surface, but he did make his point. Writers struggle with the idea that they've 'lost it'.
Reading his post, it occured to me that I might have a useful perspective on this. You see, I've lost it a few times in life. Sometimes lost and found it again. Others, just, well... lost.
Comics: I haven't drawn a comic in some years now. My last original work was two parts of a trilogy that still sits unfinished. I never meant to stop, it just sort of worked out that way. The stories that have come since then have been novels, or sometimes paintings, but no comics.
Painting: While I'm on the subject, I was a keen painter in my twenties (back when paint was a newfangled invention) but I somehow managed to go the best part of a decade without picking up a brush. Those rare occasions I did try to paint, the work simply wasn't up to scratch. I made up my mind that those particular guns had been hung up.
Then one day a couple-odd Christmases ago, paintings were requested as gifts. I dutifully strapped on my brushes and made a big old mess out of some canvases. The work lacked my old magic (whatever that was), but it was too late: I was once again in love.
I got back to painting. The magic wasn't there, but the love was back. Then Frank Frazetta's Painting With Fire gave me permission to paint like my new self, if that makes any sense. New magic came. Last year I did my best to date. This year, well... it remains to be seen.
Tattooing: I've also certainly had fallow periods in my tattooing. Times when the work I turned out was... uninspired. When I'd look at the next tattoo and think I just couldn't be bothered.
Couple of those times I took a sabbatical, lived off my savings, took in illustration work, whatever. The most recent one, I couldn't afford to quit. So I just kept on keeping on. One day, I found inspiration again, this time in the work of Guy Aitchison, Kat Von D and Nikko Hurtado. I remembered why I picked up the needles in the first place. My focus shifted. The magic returned.
Personally, I think plateaus are natural. Exercising and learning, the curve tends to be periods of sharp, upward development and long, flat stretches where what really counts is the will to continue. No reason to think that things should be any different for creative skills.