Acceptance of low moods doesn’t mean wallowing, self-loathing, or being a couch potato. Nor does it require complete abstinence from creative work. I’m thinking more along the lines of taking these moods in stride and being open to what they might teach us. Patience can certainly help with this, as can having fallback activities that are less reliant on inspiration.
Finally, I suspect that a life of nothing but euphoric highs would eventually start feeling mundane to creative types who thrive on novelty and variety. So experiencing the valleys of low moods may help us better recognize and appreciate creative peaks. From this perspective, it may not only be possible to accept our low moods, but even feel a measure of gratitude for them.