So many people major in “business” but do not know what it actually is. So good for you for pointing out how generic and BS-y it sounds and asking!
Usually you focus on an area of it. So essentially you get training in accounting, or finance (valuations, reading BS/PL). You could focus on Capital Markets, on Supply Chain Finance. You could focus on econ, regulatory capital. Anything really.
Or you do Math. The employers love that too!
Google some of those job areas and see if the interest you.