Do not listen to anybody when making a financial decision because each situation is unique. Surely deversification desrease your risk but from another hand you will not be able to earn much enough if your supposition are right. Let us have a look at and another situation if an investor are totally wrong then diversification will not help him too.it's your decision and keep fighting
When you diversify the investments, you almost do not take risks. For instance, you can spend a part of your money to buy the cryptocurrencies. Some of the money will go to buy gold, silver, or even some real estate.