Gamble is fuck terrible. There is no profit in gambling since the house is always the winner. Gold is even worse, how can you obtain profit from gold since it is too stable ? I think the best way now is to keep holding Bitcoin and sell it in the right time. Then, when its price drop, use the money which you have obtained after selling to buy Bitcoin again. After repeating this progress, I think you will multiply your BItcoin into thousand of times