Our elders have said that if we don't lose something, we won't gain anything. Therefore, if we think that we can improve our situation and our work by making some investment we should not be afraid, but we should do this work with faith in ourselves and work hard which will never decrease us and our work. They understand that if we invest money, we will lose, so how will we recover whereas in business loss is clear and has to be expected. I would call such people fools who are afraid of becoming their own standard and also reduce their progress.
Fear is reasonable to a point. Difference between having fear a lot, and having fear just a bit is investing into bitcoin versus investing into some shitty memecoin that makes you lose all your money. If you have too much fear, you do not even go into crypto, so that is out of question, but if you have just a bit of fear, then you keep yourself from making stupid mistakes and invest into bitcoin, safe and still risky and could be great.
If you have NO fear, then what is stopping you from investing into some "apeshitpepedoge" coin? You could do that, after all, there is no fear, so what could worse happen? If you say "it may go down" that is fear talking, you have none, so you invest. Hence, have "enough" fear, not too much, not zero.