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

Bro, if you are one, I would suggest you take it easy and not take any rash decision that you might blame yourself and dont also forget you are not the only one in this as everyone is affected one way or the other. And at the point it is now, there is hope might still rise since the fall is not too brutal for it to take time to recover from the shock...