You ever give yourself little writing challenges like "I will write this sex scene without using the word 'cock' or 'pussy,'"?
In my opinion best erotic scenes come without using direct descriptions of genitalias, and more are focusing on emotions and poetic metaphore. Which is a big challenge and demands great efforts, but it gives best effect.
My #1 challenge to myself lately is: can I write this *without* going into excruciating detail? It's... a work in progress.
Had an idea for a really terrible/great story, but can't write it when I've got two ongoing. The struggle is real.
I think the trick is to focus on the reactions and how the spankee and spanker feel about it rather than the actual spanks. Write about how aroused they get. Write about the spreading redness as the spankation leaves marks. How the spankee wiggles, moans, whimpers and begs for release...
Can never tell if I'm writing too much or not enough. Whichever, I am not writing exactly the right amount, or at least not the right stuff.
Word count quotas come to mind when I think of 'quantity' and 'writing' in the same sentence. Obviously, it gets kids to write more, but I'm not sure if it ever really improved someone's quality (or quantity) of life.
I'm know it's probably really bad advice, but if I'm ever in a really bad mood, I look at cute cat videos and after a while I feel better. Change animals as needed if it helps.