I sell the sunlight to the highest bidder of course?
Though to be fair, when talk about Dyson spheres (especially implied in this video) comes about, the structure doesn't cover or consume 100% of the star's light. (As described in the video as the best possible of configurations)
And if the hypothetical structure that does get that supersized, the civilization moves to the inside of the gigantuan size structure.
Regardless, we're millennia away from getting to that point of discussion.