Nice idea to make a living from Steemit. I agree with many other comments: it sounds great but is not a good idea.
I don't like to put all my eggs in one basket and would recommend trying to create multiple income streams instead. That way you are not depending on just one source of income. This is especially true when considering the unstable nature of any crypto currency. It would not be wise to bet all in one place, even a place as great as Steemit!