I have also done this, locking my Bitcoin when I think it has already reached its tip of the pump. And the easiest way to do that is to use stable coins such as USDT. Right now there are already several options because unlike before when it was only USDT that was the most high in volume and trusted as a stable coin. But locking Bitcoin at $9,000 is something I cannot confirm. I myself will not do that. I will be hodling until around $13,000.