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.
Its very wise to divide our investment. Crypto is high risk investment, different with others because others already exist more than 100 years and bitcoin only 10years. I think in next several years, people will know about bitcoin and think bitcoin is safe investment like gold