If you really hate your day job, you don’t even have to be an established affiliate to quit. There is a ton of things you can do for other affiliates to earn your first pay-check and raise capital for your own sites.
I know that a lot of people have families to support etc. and it’s not the case then, but if you are young and grinding a 9-5 at MC isn’t fulfilling your soul, you can always take another way. There’s no reason to be miserable at any point in your life. Calculate risks and take them, MC will always be there.