One thing I know is increasing the vocabulary, and keeping a diary. The question is when I start writing the diary, I don't know what should I write, ususally just a few sentence. what can I do? .
I think at this stage of learning you should not worry about writing. Keep listening and reading and reviewing words. Enjoy the process! Once you are advanced in your target language then you should worry about speaking and writing. Just focus on interesting input.
I think the best way to advance your skills when learning a different language is to develop a friendship with a native speaker.
What I've done in many language class is have an overseas penpal with whom I would exchange letters with, half in English and half in French.
I think it really helps and is one of the most effective ways to learn a language.