The reason that he could not publish his second book is that he had to publish it independently, that is, without the support of a publisher.
Firstly, the full question is: "Why the writer had enough material to write a second book but not enough money to publish it," the reason is because the material that he had created in the beginning was enough for two books, but the sales of the first book were insufficient.
When a freelance writer writes a book that he thinks might be profitable after sale, he decides to pay a publisher for the costs of publishing it, which has certain benefits if it's a success but also forces the writer to own the money from the start.
What usually happens later is that if the writer is successful with his publication, the publisher offers to publish the following books on his own in exchange for a percentage commission with respect to sales.
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