This reasoning only doesn't work for those who are leveraged, if the loss exceeds the loan you lose everything

I see people complaining that they have lost a lot of money by investing in certain currencies. I have doubts, for example.

If you buy 100 coins TODAY at 1 dollar.

Tomorrow it will fall to 0.50 dollar, that is, a 50% loss. But the loss will only be realized if I give up and sell it.

Because if I don't sell it, I will still have the 100 coins that could be worth 2 dollars in 1 month.

This line of reasoning is correct, correct me if I'm wrong.