Sit down and write
Even when you’re exhausted and uninspired.
You can always put words on the page. They may not be good words and may not be the words you want, but you can always get something.
Eventually, an idea will form. It will solidify and take shape. Again, it may not be good or the one you want, but it will be something.
Usually, we don’t have writer’s block. We have fear and uncertainty, but there’s rarely a time we can’t write.