Did you exceed the 4000-token limit for the story, or did you use up all of your free credit quota?
For the first issue, I anticipate that OpenAI servers will expand and, eventually, be able to process more information. Nonetheless, I'm working on a few solutions that involve the use of summarization techniques but it's not perfect.
For the latter, you will need to upgrade to a paid plan or create a new OpenAI account.