You have to tackle the problem from two angles.
First and foremeost, is the requirement of confidence.
Even if communication abilities are good ( language part)
lack of confidence will not help.
So take all steps to improve your confidence.
Try meditation. Do lot of self talking.
If you are already doing, intensify it.
Communication is simpler.
Speak smaller sentences till your confidence is fully restored.
Practice hard and good luck to you.