Your businesses model is wrong. Don't make your businesses/profit model be one of artificial scarcity, as it was in the previous millennium.

Instead, write a TOC and say a first chapter. And give it free. Then establish a target price/profit you want in total for each additional chapter. Setup a "fund me" and release the chapter ONLY after you've received your full payment.

If your content is good, people will pay enough for your next chapter. And you will be fairly compensated for your writing work.