well the only reason I suggested this is that it is almost sure that the price will drop to $400 or lower and I wouldn't do it if I was on the fence about the price. I can't buy more really if it drops due to having to pay rent and other expenses
Assuming you bought with money you can afford to lose, I would hold. This should be a long term investment. Unless you are day trading it. Then you might want to sell and buy back. But the moment you sell, you realize a true loss, so you have to be ok with that.
That's why if you believe in bitcoin long term, are not a day trader, then you should just hold. The market will always go up and down.
This. The market will almost certainly continue going down in the short-medium term, but eventually it will go back up.