English to Portuguese Other Business/Commerce (general)

Take the opposite side of the picture — the uptrend process. You, along with many others, bought XYZ at 12, carried it up to 24, decided that was plenty high for it, and cashed in. Thereupon XYZ reacted to 20, and you congratulate yourself on your astuteness. But then, unexpectedly, it turns around and rushes up to 30. Now you don't feel so smart; that was a better stock than you gave it credit for being. You wish you had it back. You will not pay more for it, but if it comes back down to 24, the price at which you sold, you'll "reinstate your position."