First, Check if the the price is already hitting its support. This means that it's likely that it will bounce back when it touches it's support. But sometimes that's not the case. It can break it's support and dump even more. When that happens there will be likely a indicator that it will happen. Like if the price is at it's support and there's no bouncing back this means that it will break the support. So just a tip. Buy low sell high.