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Well, you could remove it from the pot and gently massoge the root ball to loosen the soil. Shake out the loose soil and repot it in the same pot. Being root bound doesn't mean there isn't enough soil in the container, the soil is just unavalable to the main root mass. by moving the unused soil in the middle of the root ball to the botom of the pot you give the roots more spce to grow.
And I should have mentioned that it is best to do this when the soil is dry.