Regardless of whether you have a job working for someone else or you own your own business, you must see yourself as being in "business." Being in business for yourself really starts with a state of mind. A way of thinking before you actually form a legally recognized business.
If you think you are working for other people, you are right. If you believe you are working for yourself, you are right.
There are those who think they own a business when all they really own is a job. That is the business only works when they do. As soon as they stop working, the income and cash flow stop. Often these people work many times harder than people who work for an employer.
A business that is a real asset is one that continues to grow and create new cash flow for you even when you are doing something else. Regardless of your profession or what your business appears to be to others, your real business is to create and acquire cash flow generating assets.
Bill Gate's profession is a developer of software. His business was to create Microsoft as an independent, cash producing asset.
If your focus is simply working for a raise or a bonus or working overtime or looking for a higher paying job, you are not minding your own business. Those things are great when you are starting out, but you will be much better off if you take your thinking beyond these things to focus on creating and acquiring assets.
In the Rich Dad philosophy, which I agree with, your real business is to own assets which generate passive cash flow that exceeds your personal living expenses. So, even when you are working for others, you are minding your own business when you divert a portion of your income from employment to acquiring cash flow assets.
Another advantage of adopting the attitude that you are always working for yourself and that your employer is your "client," it changes your thoughts towards your job. That attitude change tends to make you happier and opens up new opportunities.
But this attitude must be tempered with the idea that you need to mind your business of collecting personal assets. If you spend too much time at your job, you won't have enough free time to take care of your own business. I know that from personal experience.