How to know if your "Basic or General English" have changed to a better "Business English" already?

Jargon. If your vocabulary tank changed from "idea" to "advice," "car" to "vehicle" or "transport," from "good" to "advantageous'" then you will realize your English is leveling up. To make this happen, practice, read as often as you want to use the language. Do not hesitate to use the new words you've just learned, but do not be an ignoramus at the same time. Do it one day at a time brother!

Enjoy the experience!

no language do not depends on steps...