I don't have much advice on that front since that is one thing I've never actually had an issue with (unlike literally everything else about it, from craft to marketing).

Ideas tend to come for me all the time, _but_ I noticed they sometimes flow even more aggressively when I read other fiction books as well as when I go for a walk out in nature. I think consuming stories just generates more stories.

For my last novella, I actually brainstormed it with ChatGPT. I already had a general idea and theme, but needed to brainstorm some plot points, character motivations, etc. I found using ChatGPT as a more advanced rubber ducky helped spark the imagination and flesh out the plot. At one point I even did it through ChatGPT voice on my phone while on a bus, and actually _talking_ through it in some ways seemed even more effective.