You say that you "already successful with the same idea on another industry". What that success looks like? Can you transfer part of that success to this one business as well? You talking about $800k for six months, where is money from your previous success and why you do not invest them in your new business?
You can check the success of the last project by reading my post
here (check archive for link), and if it is an indicator of success then everyone in their right mind should seriously ask themselves whether this project will end in the same way.
All those figures that the OP brags about are just imaginary numbers in his head - on paper it may look good, but in reality it is not easy to achieve even 10% of what is imagined.