i always have my own plans and the target of my investment. Based on the market and numbers, i will sell out amount of my bitcoin when the price reaches to 12k and i will holding the rest to waiting for the next wave. Many people go panic of bitcoin's price and sell out as much as they can when the price falls, this is a good time for me to buy in. People should have their own plans for investment and try hard to reach the target of those plans.
Your target selling is good. The better gonna do if your target price already reach that better sell only the half and hold the other Half incase the price increase more. Because if you sell all your bitcoin and bitcoin increase more you lose some profit . Better if you have plan like plan A and plan B . My atrget price already reach brcause it's 10k dollars and next is 15k or 20k dollars.