Unless bitcoin goes to $0. (all the computers blow up, Mad Max, Complete Utopia without money...)

There are two types of traders.
Active and HODLERS.

To say one is wrong is disingenuous.

So, if you are an active trader, you try to figure out what the price will be, and bet on the price action.
During a bull market (or adoption market) you can usually make money on your trades more than 51% of the time. Its pretty easy. But you have to be on the ball.

If you are not an active trader, and you know (we all know) that bitcoin is going to $1,000,000.
Then all you have to do is sit back for a while, and soon you will be a millionaire.
You just have to HODL through all the lows, and all the people yelling at you that you should have sold yesterday.

BUT! There is one thing that may make HODL far superior.
At some point, bitcoin will go no bid.
You will not be able to buy back in with any fiat currency or fiat derivative. (USDT, USDC...)
It is a very BIG possibility that the profit you took will go to zero.