Some people talk about writer's block. The idea is that you have a clean slate and can't seem to form any thought about what to put down onto it.
For me, writer's block is more like what happens when you try to pour mayonnaise down a small funnel. Or pour potato chips out of a bag with too small an opening at the top. There is plenty of material in the queue, but it won't get in line and go with the flow.
I started to write a post about grief a few weeks ago. The words poured out at first. I had all these things to say... then I didn't.
Have you ever mixed paint colors? There is more technique than theory involved. The result you get depends on the brand of paint, etc. Last time I tried getting a creative palette with acrylics, everything ended up looking like mud. Same thing with writing, I'm afraid: I poured a bunch of thoughts out into the open, and it did anything but clarify.
So maybe some day I will go back to those thoughts. When I have thought funnel with a bigger nozzle.