I'm training to be a Kundalini Yoga teacher because of the impact this practice has on my life. There are kriyas (sets of exercises) and meditations for almost any situation you can imagine. We often take one kriya and practice every day for 40, 90, 120 or even 1000 days. But even just once or twice can induce transformation. Here are some practices specific for Improving Communication.
Kriya to Solve Communication Problems I've done this one and it works.
There are many more here! Search on "communication".