Grüezi, Dominich! I'd be happy to chat with you about your situation and recommend a plan of action based on your personal learning style. From looking at your profile, I'd say we'd probably want to design a course for you that teaches grammar in a systematic way, but in a conversational framework, because most people learn best by doing. Also, it would be good to identify and master your personal "problem areas." In addition, you'll need to do homework activities to accelerate your progress (choose the ones you most enjoy, of course). Besides "academic" study, it would be good if you could watch T.V. in English and find a native English speaker as a girlfriend. If that's not feasible, I will confess that I used to sleep with my German dictionary. Things like this let your unconscious mind know that you're serious. Auf wiederschreiben!