There is a common misconception amongst qigong practitioners that you can become more powerful or energetic by adding Qi.
The truth is that cleansing will likely be more beneficial.
Imagine that you have 100 units of energy flowing through a meridian to an organ. But due to blockages in the meridian only 50 units of energy reach the organ.
Now imagine that through focusing on cleansing in your qigong practice instead of building, you get rid of some of the blockage and now 75 units of energy are reaching the organ.
Think you might feel more powerful and energetic? You bet.