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Try to breathe mindfully; be aware of in breaths and out breaths and also be aware of the length of the breath more often. Make it so that there is a proper rhythm to it, and a habit.
Important bit is to combine it with mindfulness practice in a gentle fashion - stressing gentle.
On the other hand, how wonderful that you will be doing it mindfully with such purpose!
There is also a beautiful yoga in Dzogchen tradition called Yantra Yoga that is a yoga of breath; it is worth taking up classes for great benefit.