Writing is the really specific skill. I now a few people who writes well in Russian and no matter that this is their native language. When I read messages from my fellows I often can't understand what they exactly want to say. Yeah, if you need to say Hello or Goodbye, there's no problem for the most of people. But when they need to write a few sentences they send finally a mess. I noticed that there's no connection between speaking and writing skills. I made my notes reading messages from my fellows, which I know speak very well. Some of them love telling stories and do it well enough. But unexpectedly they can't write a correctly constructed sentences not to mention the whole text.
As I mentioned before I had noticed that there's no connection between speaking and writing skills. But I see some interconnection between reading and writing skills. If you do reading a lot, especially efficient reading, you train your brain to remember the patterns. When you write something wrong you start feeling uncomfortable because your brain says you: "I can't remember a pattern that suits to your construction. Don't write it this way, it's wrong." If you even doesn't hear this inner voice you understand that you made a mistake anyway. This filtration process of your texts is based on your reading: what you read and the way you read, how often and how much you read.
When my brother and I were kids we read a lot and we discuss our books after it. We weren't forced to do it, we just read the same books and loved to talk about them. It helped a lot to became good speakers I think. I chat rarely but if I have a good interlocutor I express my thoughts in a proper way, without any long pauses and bad words. My interlocutors always understand me very well, even if we speak about something they have never met before. I'm sure that I got this ability from the reading with next discussions. When I start writing at first I was amazed how it is difficult and easy simultaneously. Difficult because you have to force your lazy brain work and easy because with starting you see how words get out as if it's a flow. I am sure that I can express myself the way you understand me due to my love of reading. Patterns in my head help me to write the readable sentences and I repeat it again: "I am grateful for the reading or if to be exact thanks to my parents who showed me that I can find immeasurable worlds inside the books." It gave me the passion to the writing and now even when I don't write well yet I do it with a great pleasure and readable structure.
It is difficult sometimes to start writing something, especially when you have to do it due to your English learning goal. But I want you to remember that you don't have to practice writing on the grammar books. I think they are really boring unless you have a special mindset. I would recommend you to write only what you are really enjoying of. For example, I love reading or listening audiobooks about self development. Especially I love Napoleon Hill's "Think and Grow Rich" and Earl Nightingale's "The Strangest Secret". So, why don't I write something about one of these books?
Here's a plan.
1. Listen to an audiobook or read a book. Write out your notes.
2. As you have finished listening/reading sit quiet for a few minutes. Let your brain digest the information.
3. Take a pen and a sheet of paper (or a notebook) and write down all your thoughts in a random way.
4. Then imagine that you are meeting with your friend or the author himself and discuss the whole book (or a chapter or as much as you have read) with him in your notebook. I think you will get some questions or maybe you will want to tell some example stories from your own life. You can do it not only for yourself but for your friend or imagined friend as well. It helps to have a good and profound dialogue without stress. Make yourself do it on a sheet of paper or in a notebook. You have to write or type it. It makes you think, search for proper words and maybe quotes. During this work your brain scrolls the inner dictionary and your passive vocabulary becomes your active vocabulary step by step. If you do this practice every day or at least twice a week you raise your active vocabulary exponentially. To be honest it grows day by day but not in the exponential way of course.
I also noticed that if we never met some words before we can write them correctly if we do reading a lot. Today I wrote the word "exponentially" for the first time and I don't remember I met it before in English. Despite that I wrote this word correctly without peeping in a dictionary because my brain has many patterns and he says that this word should be written this way.
If you can't make yourself do this uneasy work you can choose other option. Just start write some thoughts in a diary every day. It doesn't have to take an hour, just a few minutes. Try to remember one or two things that you heard or saw during the day and write it down in your diary. Do it every evening, for example, and you'll see good results in a month or so because such practice can't go with no trace. For the first few days you will have difficulties with that exercise because of the famous laziness and the lack of practice. But if you will manage to get through this hard time you'll start writing more and more. You will enjoy your writing soon, just keep practicing and it will be easier and easier for you.
You can write out quotes and favorite sentences and paragraphs and that's it. Someone thinks that this is the best way to train you writing skill, just write as much as you can. But I can't agree with this opinion because your brain doesn't work hard during such "practice". This method does not differ from simple reading, it's the same actually. As for me, your brain does the hard work only when he has to build sentences by himself. It means that you have to make yourself write your own sentences, what forces your brain work really hard.
You reap what you sow. When you do the hard work every day by making yourself build sentences, remember something, speak in English you become good in English. Such daily efforts help you become fluent in English and you get good results. If you think that you can limit yourself just by reading and listening you will never become a good English speaker, you will never get the Fluency in English. If you sow bad, weak seeds don't expect good fruits.
Just do your daily efforts and be happy.