So your language skills are good: your grammar is in control, your vocabulary is varied enough. What can you do with it? Communicative skills are those abilities that you can use in different situations. For example asking for permission,  apologizing, defending an idea, explaining a concept…

Developing these skills will open your horizon to new possibilities: these are versatile skills, and many of them are also skills for life, that you will be able to use outside the workplace.

Also with every step in the process (remember the three layers, this is number two!) you need to practice everything you learn. Not only to consolidate your knowledge, but also because you are doing all this in order to use it, right?