I’m a complete novice but I do agree with the berms and swale idea. I’ve got some other plant options that may work. Swamp Mayhaw tree and Pawpaws (need lots of water), Herbs - mint, motherwort, marshmallow, and comfrey of course….it’s usually in the name so think about that too! Ie Marsh - mallow. Also, I’m sure you know this too but the larger the leaves the more water needs (like banana and Pawpaw). Hope I added something. I live in Flagler beach btw.