"Sprachgefühl"

[Miena Yuki]

It won't work unless you move to someplace you hear it daily, I think. Main point is to use it constantly on an active level, aka speak with people who have it as their mother tongue.
As for the grammar, I feel your pain. 10 years and counting, my sentences still fail and leave me ashamed from time to time.

[Jenna the Devil]

Drink more beer biggrin
That's what I do rofl my german is better when I'm drunk rofl