English is the business language of he world. Language isn’t the only aspect of communication but it is a very important part of it. The only way to get comfortable with a language is to practice it. So, practice English in every way.
Reading and listening are easier and one can do a lot of it. However, writing and speaking are essential to really know it. If you noticed, the first two aspects are for receiving information, while the latter are for sending. Sending also involves creating the information, and that’s what makes the practice better.
Note that all the above aspects are just a start. Eventually, language has to be used in tandem with other aspects of communication skills, to be effective.