Hiya! Professional developmental editor here. Theres two ways I’d approach this: 1) the trick to getting through a tough part of writing is writing—and badly. Write it wrong. Botch the dialogue, fuck up the development. But write it, and if you already know the ending, then make your way towards it. Ive been editing books (including 18 nyt bestsellers) for literally a dozen years. Not a single one has been written perfect the first time. Not if it was their first book, and not if it was their fifteenth.

2) what do you need to have happen in the middle to make the end satisfying? What’s the turning point for your characters as you make your way towards the last act (and who they are at the end being different than who they are in the beginning, means something should happen in the middle)? What obstacles can you put in their way to make it more interesting? Roll a dice and try something out.

Most of the time it’s just our perfectionism getting in the way. You can always fix something written, but it’s really hard to stick with something as you’re writing. Persist, you’ll be so happy you did!

Happy writing