There is no better way to learn than practice. If you really want to improve your writing skills, you must get into the habit of reading and understanding. You don't have to read journals or encyclopedia, just everyday A1 pieces, dialogues, conversation etc.
There are many courses online these days that can help brush up your English skills. Lucky for you, a lot of them are free courses. If you need a faster pace, you can even hire a tutor.
In my opinion, whatever language you want to master, you must get closer and be well acquainted. Watch plays, movies, theatre etc.