Well if I were to rope, I'd either want to focus on blocking my carotid, or dropping with enough force to break my neck. There have actually been cases of people accidentally roping, usually fulilling some sort sexual fetish, because of how quickly you lose consciousness when blood flow from your carotid arteries are blocked. The sudden drop in blood pressure to the brain when the person realizes what's happening and relieves the force from their neck, well that's in particularly deadly, as it will immediately knock them out and they can fall back into the previous position, inevitably killing them.
Whatever you do, don't try to suffocate yourself, that would feel awful and take a lot longer for you to lose consciousness.