We become food for the worms and maggots. Our bones turn to dust so we possibly could become a mountain, a river bank, mud, or dust in someone's eye. Minerals for the soil that feed the trees etc. We could then become part of the fruit of that tree and be food for our living relatives. Mind boggling what could come next.
It won't. But if it does, please e-mail me in case I missed it. If it does happen, it will be a solar flash, which is the sun getting way too close to earth, then heating up too hot, and then traveling away