Even when you don’t have ideas, still show up and play on the page.
Put in your time, even for a bit. Free-write for 10 minutes or 500 words, whichever comes last. See if it sparks any ideas.
Play with images in your head. See if any characters show up that are doing interesting things. Try to put the ideas in your head into action.
The important part is not to avoid the work. Do a little bit regularly.
And have fun while you’re doing it.