You have a long pier on a fairly narrow base. Did you install reo bar in the pier form before you poured it? Concrete can flex on its own and reo should be used to provide the necessary stiffness. If there is no reo in the pier you could try bracing the pier (at say 45 degrees) from under the floor to the ground with something like galvanised angle iron , but would need to work out some sort of collar design to weld the steel to. The brace anchored to a ground slab might be fine
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