When my portfolio has risen about 50% i take out 10%. (5% in euro wallet and 5% in new ICO's)
My current strategy to take profit is to trade quickly (scalping). I can't hold it too long, it's very risky. I only buy with a portion of capital and when prices rise 2% to 10% I will take that. and repeat it for several times on different coins. after the target is reached, I will pull it on the fiat wallet.