You need to do away with all the Set/Get variable modules and just use a Text Aggregator to combine all the chapter content from OpenAI.
updated-blueprint.json (45.4 KB)
Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Did you know, the concepts of about 70% of questions asked on this forum are already covered in the Make Academy. Investing some effort into it will save you lots of time and frustration using Make later!