You could brainstorm instead of writing a complete sentence. If you are not familiar with the brainstorming approach to plot-writing, Google it online. It works very well for some people. The “branches” are ideas that may be useful parts of the plot; you can take advantage of them as they present themselves by plotting the different ones on “balloons” and drawing lines between them to show how they relate. That kind of thing. It’s a different way of organizing. You might even want to sketch in cartoons to help out your thought processes and fill in the blanks. I trust that eventually a great story will gel, and it may not be the one you had started out to write but possibly it will sell. It’s worth a try, at least, if it works for you.
Needless to say, you’re going to have to write it out in the conventional way eventually but I get the impression that you’re struggling at the stage of getting your initial thoughts on paper—or the computer screen. You sound like a creative person who needs a creative approach. Take it.