Guys, share your helpful tips, please. Thanks in advance
Actually, you can find plenty of ways of improving your skills. For example, reading a lot would be very useful, it really helps. In addition, you will develop excellent grammar skills by writing own articles daily. But I recommend language courses, I think it's the most effective way linguatrip.com/en/english/
I would suggest reading books for leisure, on topics that you enjoy. By reading, you will see how in English we formulate sentences and learn about structure. This is important because you see how sentences are formed grammatically. You will understand many of these patterns through reading. You will also gain new vocabulary this way, including context (the situation that the word is being used).
So, what can I tell you...I used to struggle with the same problem for years, but a couple of months ago a friend of mine offered me to read a really old, but at the same time the most useful, I suppose. It calls "English Grammar by Murray, Lindley, 1745-1826|". You can actually read book right here- there are not only professional literature, but you can also find a lot of entertaining stuff there. Go and get it, pal.