One reason why thinking out-loud is helpful is because sometimes, something else you say about a topic becomes the source of inspiration. Is the topic really “broad?” Maybe, and maybe you can play on that.
If not, you could try a more deliberate brainstorming exercise. There are two very good ones I’m aware of:
- Building a mindmap - loads of information online about how to do that
- Something I call “Word Association Chains”. It’s similar to mindmapping, but instead of isolating dimensions into separate branches, it operates in a single long line, often with no actual end-goal in sight. See this (it’s where I first saw it many years ago!):
https://youtu.be/Tb53JSC_Z6g?si=-92GOjZBbzvPGPqX&t=1250
No doubt you’ll get there before long; it’s not like you’re short on creativity =)