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Congratulations! You're growing it very well.
The medium is still fresh. You could repot now, or wait a while. They tend to grow fine when very rootbound so long as they're well-watered. Next time you'll know how fast they grow for you, and use a proportionally larger container.
Most people repot Phrags every 1-2 years. The medium doesn't last much longer when kept very wet. So keeping it in that pot until next spring would be fine if you want to do that.
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