Deciding to quit my well paid job

Hello, my impossible goal is to earn 1M by starting my own business and i have a lot of determination to do it. However, I know that my existing idea (B2B sales consulting to high potential startups) will probably not get me there. I have to trust that it will result in strategic byproducts or seeing new opportunities. I am a bit hesitant to pull the plug with my current job as it is very well paid (up to 200K) and i will most likely be promoted in January. Still, i want my own business and i know it can create more value and more income for me. How do i make my call?