That outlet may not have any conduit associated with it. In other words, it may be wired using direct burial wire. I'd carefully dig around it with a small hand shovel after the breaker is turned off to see. Then all you would have to do is move the post/outlet 6 - 8 inches closer to what it is wired to in order to get the 6 - 8 inches of wire needed to raise it up. If you have to splice the wire to then you'd be required to put the splice in a covered above ground box.
If it does have some conduit, it may simply be a short piece to give support to the riser. You could still move that the 6 - 8 inches too.
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