I'm scared because price Bitcoin down, I do not know what to do with Bitcoin at this time

Just take it easy and relax. As of this time bitcoin has stopped dropping. Almost 100$ was dropped from the current price because of the dump. But we don't need to worry soon it will climb up again and will return to one thousand dollars each. Though this is just an opinion but if we panic now and lose composure we might end up in a losing streak.