Sometimes you need to prime the pump so to speak before writing the next chapter in your novel, or starting a new story. Something I often do is open the dictionary to any page, find a word and start writing. Another idea is to take a line from a book you like, and flesh out a paragraph from it. Or you can choose a writing prompt and go to town. Reedsy’s website has a page devoted to writing prompts, 1100 of them to be exact. https://blog.reedsy.com/creative-writing-prompts/