My NO.1 trading rule.

Never sell in the red.

It os simple, but instead of pulling out when losing, I buy more to average down. When purchasing securities, or crypto, you are already taking a single gamble. If you believe you could make money on the equity you will get from pulling after a loss, then you will be gambling twice with the same money with a guaranteed actualized loss each time you sell in the red.

Averaging down allows you to make equity from a stock rise and allows for faster and possibly more gains when the stock goes back up again.

Hope this helps, and happy trading!
-Lou Blacksail