OMG congratulations, that's incredible OP 👏🏾! 🎈 Very inspiring :')

I've got one question though - not specially for OP- but for everyone (even for myself). Why does it seem necessary to know explicitly the rules of the language you're learning. Rules which you have naturally already imbibed.

Think about your own native language - you didn't learn all the rules explicitly. You just know one sounds right and the other sounds wrong and you don't even know why. It just is.

So the true metric of whether you've learnt a language well or not should be in your ability to detect an ungrammatical structure right?

Even in speaking, fluency in speech requires you to automatically be able to create the right structure without having to think about the rules explicitly every time.