Yes, you shouldn't invest all the money you have in one place of investment because it's very risky. You must have real money reserves to protect your needs.
there is a difference in the mindset in which the word "all" is relative, the greater the capital of those who are not connected with the necessities of life, the greater the percentage of investment, so that large investors have done the standard according to their abilities. But I personally am also anxious if I believe fully because I still need a lot of fiat capital in real needs.