I'm a sales engineer and I think this tool could be useful.

I would also look at driving leads based on customer pain points. If I could train your system to use my docs that would also be useful. I would also want to exclude my competitors from my training data.

Maybe also focus your tool around government RFPs. There are a lot of consultants out there who make a lot of money writing proposals for various companies and it is quite time consuming.

Other questions:

Does it make sense to have a salesforce integration? Does it make sense to have a Jira integration? Does it make sense to have a confluence integration? Does it make sense to have Google Doc or Office 365 integration?

Maybe make these plugins and attend a Salesforce and Jira conference or two.

Good luck!