I noticed on a trade that after we sold it, the trade went higher. Does that mean we should have waited longer to sell it since we didn’t catch the top?

Absolutely. If it were possible to trade the left side of the chart, we would enter every trade at the absolute lowest price, and we would exit at the highest price. Furthermore, we would do this 100% of the time. Unfortunately, we are only able to trade the right side of the chart, where we can’t know for sure if we are at the top, past the top, or if it is still ahead of us. Because we do not know the future, we have to gauge probabilities and exit when our indicators tell us to do so. It is simply impossible to catch the exact  top and bottoms of trends with any degree of consistency. Fortunately, we don’t need to in order to succeed at trading.