Potential Investors always look for proven ability before they are willing to risk investing their money for equity in a product. Have you thought of creating an MVP to demo to your potential investors ?
For the benefit of the larger audience, when designing a large product, as you probably know, the first step is to select a crucial module/ use case of the product /service and and implement the same using a technical platform you are comfortable with and able to prove your product visualization capability. This would not really require a large funding, and the best option i have seen in many cases is to borrow money from Friends / Family. That way you will know what are the pitfalls your product is likely to face in actual development. The proven logic is its easier to convince friends / family to believe in your startup than to convince an absolute stranger(i.e investor) to support your entrepreneurial ideas.
Every product startup claims to be different , and it is usually at the cusp of development that one begins to realize if truly the innovation that you are talking about is practically achievable and salesworthy. Also by sharing the demo product with forum users, this gives you an opportunity to get a feedback loop around your MVP to get it ready for demo to a potential investor.
All the Best Venad!