Get a German pen pal, Speak to your cat/dog in German, Watch movies in German. IMMERSE YOURSELF.
Seriously, that's the only way you will be able to develop your German to become more natural and feel correct.
That's what i'm doing, and so far i'm averaging in the high 90s.
Wenn du willst, kannst du mir schreiben und ein bisschen Deutsch lernen
Good videos and films are anything that's for kids, it's basic German, and tends to cover the options you learn in school.
Try finding some cartoon versions of German fairytales, though they can sometimes have tricky past tense grammar in them.
Disney movies i find are good, and a good pen pal website is students of the world