Answer: Sago palms are slow growing and can take their time opening up. When the roots are happy, the plant will develop new leaves. They emerge as light green spikes, arranged in a circle around the perimeter of the trunk. They slowly uncoil growing to the ultimate length of the leaf. Then, in a graceful choreography, the individual leaflets unroll away from the midrib and the whole column of new leaves relaxes into a rosette that sits just above the existing crown of leaves. I wouldn't transplant your Sago, unless it is obviously potbound (roots escaping from the drainage holes of the pot).
Best wishes with your plant.
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