About Improving speaking skill (my opinion)

I've been studying English for almost 10 years since I was a freshman in an University. Recently, I realized that the most important thing to improve speaking skill is to understand the English used and spoken in the specific situations and contexts. We need to implant images of which native speakers use their english in specific occasions, in our brain. If you do this, you will come across light-bulb moments in you daily life when you try to speak English. 

Through out this process, you can learn that words and expressions used in specific situations.