Hi saturn
From your description, it seems that right now, you're over-focused on the writing aspect of your game. I suggest you to add some variety into your work and touch on other aspects of your game like music, graphic and programming. New writing ideas will spark while you work on other tasks.
Take my advice with a grain of salt because, as you can see from my games, writing isn't the primary focus of my games.
I hope this advice helps you.
Best of luck in your game development,
Irog