Marathon was devastated by Hurricane Irma, as was most of the Keys from Marathon to to Cudjoe Key (about 20 miles East of Key West). I could easily imagine every person with building / construction / repairing skills is booked solid for the indefinite future.
As noted above, you might try Key West - they fared much, much better than Marathon, et al, and the businesses there tend to be more like actual, established businesses than in many parts of the Keys, where things are a little more "casual".
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