While I agree I do believe people should take profit if they want to. While a 100x future return is tempting the 10x they're sitting on right now could be life changing.
What people shouldn't do is dabble in trading. I learned that the hard way. I was trying to be a genius and timing some dips but ended up losing 7% of my portfolio in the process.
My tips: Hold. Take profits if you want. Never trade.