You can stay there, opening your shell and filter feeding when it's convenient, and closing it again to hide inside when there is a predator around. You release many, many tiny copies of yourself, which float around with the currents until, in their turn, they find a good place and stick themselves there, where they grow thicker and thicker shells and make more copies.
Interestingly, since the Permian-Triassic extinction event, which didn't quite wipe you out, you haven't grown back as rapidly as a closely related species, the bivalve molluscs. As a result, they appear to have dominated the upper, richer, waters, and you are mostly found at deeper locations.
It's a simple, relatively low cost way to make efficient use of free resources, and you are found in deep seas all over the world.
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