If you look at Tesla chart, or any other tech stock chart, you can see that nobody would have lost money if they didnt sell. They are all going up long term. Tesla is up 100% in three years, 240% in five years. Everybody who sold during that time made the wrong choice, unless they invested in something that went up more.

Just dont sell, ever, until you retire. This is super hard to do but its what the charts show is actually best.