It is frequently enjoyable to come to the end of a writing project. There are four, count them, four on the shelf. I have enjoyed all four. Now I have a problem. WHAT'S NEXT?
There are 18 ideas in my notebooks. Which one? I have not fleshed out the basic, one page plot line for any of them. The one sentence idea is there.
My solution - I will take the one I relate to best and just start writing. Somewhere along the path to the end I will find a beginning.
Go write, quit hanging out on the net.