You aren't going to get a response that long. That is just the limitations of LLM's. If you do manage to get something that long it won't make sense as it can't hold enough context as it generates.

You can get a really cool, coherent story of any length you want by writing one or hiring a writer.

The limited context lengths for local LLMs will be a barrier to write 10k words in a single prompt. Approaches to this is to have the LLM have a conversation with itself or other LLMs. There are prompts out there that can simulate this, but you will need to intervene every few hundred words or so. Check out ‘AutoGen’ frameworks that can orchestrate this for you. CrewAI is one of the better ones. hope this helps

Have a peruse of this article. Various different options for running LLMs locally

https://matilabs.ai/2024/02/07/run-llms-locally

GPT4All

Ollama provides a Python API which may be useful. You could have it generate the story in chunks, having it generate a list of key points which get passed to subsequent prompts. Maybe...

Try out some of the options listed in this comment https://ttrpg.network/comment/6729305

I feel like i've seen someone ask this exact question here not too long ago. Was it you?