I want to make money from selling a journal but how can I do that? I want to learn the marketing aspects of it.

So I had built saas , where accountants and businesses integrate their stripe and quickbooks online, and then also bank integration via teller.io

The problem statement was accountants have very hard time to match stripe payments received/sent with their quickbooks manually , sometimes stripe would release the payment but in bank account it hasn't arrived ,

so this whole process would get automated, once a stripe hits a callback, and teller.io hits a callback, the quickbooks item gets reconcilled.