This is the sad truth: No one would invest in a casino project unless they see the stats or you have a really solid business plan along with an investment to back it up. Crowdfunding doesn't work for casinos. Do you know any publicly crowd-funded casinos before launch?
The possibility that the OP will find a potential client in the way he is trying to do here is quite unrealistic, I would say impossible. So someone who has enough money, and wants to have their own casino, will just contact the OP and start a business.
In the end, the coding of the casino application itself is not the biggest problem, but that comes later. regular maintenance, update, and correction of defects. No matter how good OP is at his job, it takes more than one person. That's why everything seems quite immature to me, and therefore not the best recommendation.