I think Real estate and Gold are safer but Cryptocurrencies can bring a lot of profit if you have a exactly choice. For me, i only invest in cryptocurrencies 30% my saving money.
Yes I agree of that Real estate and gold are good investment and low risk but the profit you gain are not higher than investing in crypto. Investing in crypto is a good choice cause it will gain more profit. Investing 30% of saving it is good cause it will increase more than you expected amount of interest.