You can create an exponential growth of seasteading units. Like a seed you can use a floating dry dock that can eat waste from civilization and render another unit of the same type that simultaneously produces seasteads of many type. In deep ocean there is temp difference from surface to depths and can generate energy with right tools. Also if rising ocean level becomes a problem for planet you could build a platform supported by pillars and then dig up earth and pile it above the surface of ocean to create artificial land while reducing water volume if enough earth is mined from under ocean.
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