I think gold is a safe option. Although bitcoin is a risky option, it will make you rich in future.
There is no guarantee about Bitcoin. Either it can make you filthy rich, or it can eat away your investment. Are you ready to make an investment in Bitcoin at the current prices ($6,600 per coin)? The psychological barrier is always there. When I entered the Bitcoin scene, the exchange rates were going at around $1,000 per coin. Now it has increased by more than 6 times.