Have an MVP (minimal viable product).
Having an MVP does a few things:
1. You can engage in Triangle Financing and make your investment crowdfunding an easier journey.
2. Having a product lets your potential investors know you're serious and further ahead than just having an idea.
3. The hardest part of crowdfunding is attracting the crowd. When you have a product don't just attract the crowd to invest, invite them to buy your product. That is called generating revenue. Revenue is the best capital in the world.