Assuming I can't subsequently be human again, I want to be something higher on the food chain...like a flea. Fleas feed on humans! But I want to be a stupid flea that is immediately killed between the fingernails of a human so that I may reincarnate back into a human pest control operator ASAP that rarely deals with fleas but instead makes a living off going door to door selling costly fear to people with phobias, but later learns that he's no better than a stupid flea and is thus improved by it in the eyes of the Divine Sea Cucumber and all.
Oh, that was fun!