Honestly, u/Emergency-Wave-5335 is right. Maybe not move addresses, but definitely move the shed. If you have a region that regularly collects standing water, then you simply can not place a shed there without doing massive soilwork to remediate the drainage.

You'd have to excavate down like 3 feet and replace all that soil with sand and other free-draining soils. Either that or re-grade the entire property to divert water from it.

You may be able to get away with building your structure like a dock, though. Florida's marshlands are used to that in home construction. Set posts 3' into the ground, and basically build a deck that supports your shed. That would certainly be easier than all the earthwork. However, the posts will rot out fairly quickly in those conditions, much like how the docks do.