you can use it as an investment which you buy and hold for long term, or you can day trade and make profit daily based on its daily fluctuations which are big enough for it. and all the while you can use your bitcoins to shop and pay for stuff online or offline.
you can also use bitcoin to start a business, a new one which doesn't yet exist so that you can become a business owner and earn real money on your own.
I agree! There are many possibilities that we can do with bitcoin including all of what you have said there is no limit in what you can do with it, And I think this is all possible thanks to the Blockchain technology, That is why we can certain do all of that stuff so why limit yourself in choosing just one if we can sure do all of it, And I really think there are still things we can do about bitcoin the progress is still there and not limited.