If the price do go down youre not going to lose all your money. As a Bitcoin investor you should know how much risk youre able to take and avoid taking more than that.
You can keep your risk level at fifty percent % and when you invest and the price drops to the extent of losing that much you can then withdraw and wait for another time to invest it back. This is why as a Hodler you should always do proper research before buying Bitcoin, a wrong investment is going to make you regret ever investing in bitcoin, because after waiting for a long time and gaining nothing, its quite frustrating.