I don't think what the OP did was a mistake, because you are selling in a profitable position, maybe there is only regret because after you made a sale and you thought it was the highest price and it turned out the price was even higher.
and events like that are commonplace, because everyone must have experienced it, myself included, and it will be an experience and must be realized bitcoin is not easy to predict and long term is the best.
The ops should consider changing the title of this thread to reflect the try condition of the message because what the ops did was not a mistake but just cashed out when the market is still at its early stage of price bull run.
I will suggest you learn how to be more patient next time or try to set a selling date or amount to your investment 3