I get that you don't want to tell us what it is, because you're worried that someone will just take the idea, run, and leave you with nothing.

But you need to tell us something. Is it software? Hardware? Does it build on something that exists? Is it an painkiller or vitamin?[0] What would the ideal time-scale be? How do you know there is a market?

Something.

[0] https://www.entrepreneur.com/article/230736