Keep calm and HODL on
You are right, we should hold good item and wait for a good rate & we should not sell until it reach on our goal, it will be a wise decision and for that price also will increase.
From my experience we need to keep hold of the assets for a longer time period, but the same shouldn't be kept idle when it reach a better price. I've done it without understanding about the market, and the same caused me with a big loss. The value of my holding have gone down to 100% and now waiting for such a growth, but there is no positive growth as the one I've missed. Long term holders need to be careful not to miss the right moment.