As a professor of French and Latin and also student auf Deutcsh, I have already developed some methods of learning one language, so I can give you some advices:
The most important is to learn and practice by yourself, on the first place this means to take a look on your notes few hours every day after class and to do homework. Good grammar base is important for speak language properly, so when you finish your homework, go online and find free grammar exercises, and be in a rush for a higher score.
Also you need to be motivated, to find the text in German that you are interested in: articles, books and newspapers, and even if you don’t understand it’s important just to try. Internet is a gold treasure for learning foreign languages.
Good idea is to make your own vocabulary, take a look around you, find the first theme and then write all the words coming to your mind in that moment- for example let’s take food as a theme, and start writing all associating words: drinks, fruits… continue with the recepies- cooking, baking, than in the restaurant- how to order, menu… Also you need to know that the best method of learning words is by repeating, so after writing, you cover your list and try to repeat.
Finally, most important is to be free in conversation, not to get scared that you will be wrong, it’s better to say even if that is wrong than not to say and not to practice.