You are working very hard to improve your English! It is more than what most of my students do. I have noticed that my best students read a lot. It does not matter what you read as much. Personally I prefer novels, because it is difficult to put a book down if you don't know if the murderer will be caught or if the lovers will find each other again. It does not feel that much like hard work then.

Another strategy is to interact in English. Look at blogs and share your ideas. If you are interested in cars or cooking, look at websites and think about your interests and what you want to know. Don't think of working hard for English. Just absorb the language almost by accident while you are thinking of other things.

Finally, if you want to know exactly how much you are learning, try getting a practice book (e.g. vocabulary or grammar) and do the exercises. Check your answers and mark the ones you had wrong. Learn these and then next week you do the same exercise again. You will see how you progress and will feel that you are working really hard.