All depends on the rate at which you bought your Bitcoin or coins. If you think that you have made enough profit from your investment in crypto currency at it's current market value.what are you waiting for than to sell and reinvest since you equally believe it's market value will continue to rise.
thinking of investing, or trading is indeed quite difficult. However, several times I thought about investing in several ICO projects that have such good developments, even very quickly entering the market with high prices. however, the current conditions made me think of holding back the assets that I had. this is indeed a difficult choice for now.
a lot of ico that once listing in exchange, the price immediately dropped. this is indeed influenced because of the decline in the price of bitcoin. therefore I prefer to invest in the top coins, thus reducing the risk