I didn't ask what the point was, phrasing is important here. I said, "what more is there to train for?" and, "where does the motivation come from?" I'm just posing questions.
Fun as it may be, BJJ is still hard af, especially when there's no incentive beyond rolling for the sake of rolling. Are you a black belt?
I think the real issue is why do you train jujitsu. If you do not enjoy jujitsu by itself, it will be difficult for you to continue training after you reached your perceived goals. Also, ego has a lot to do with it. Many black belts stop training because they feel like they cannot lose during practice, and they Roll way too hard leaving to injuries. Or they lose and they get disappointed/upset upset because they lost.