It’s the idea that from 9 to 5 you are like a slave and you are not living your own life, you are giving up your time to render a service for someone paying you to do it.
We can sit here and move the hands on the clock and try to make your day look more interesting in all sorts of ways, but in the end you will work those hours, all the same.
So what do you do if you don’t want that life? Find a way to get your income not from services you perform but through other means which are inherently timeless.
In the best case, what this looks like is you living your own life on your own terms while making decisions that feed income into your revenue streams whenever necessary. Before I continue, is this what you want?