If you don’t have enough cash yet, you have no choice but to continue on your day time job and work part time for your business. This is at least the case until you can meet all your financial needs to operate your business free from your day time job.
It has something to do with preparation. How prepared are you in terms of financial requirements? If you know you are not financially prepared, then do your business in a part time basis. It is better than pursuing on operating your business full time and end up failing because of the lack of financial support.