Market is down at present and i think invest as much as you can as after correction phase prices would surely surge and high profit is expected on return.Holding currently is another good planning to earn a considerable return as per your planning.If you sell your investment due to low prices you would not be able to receive much profit.To me currently both Investing and holding strategy are inevitable...
Holding your coins is the most safest and commonly do when there is a crash. Some of us probably lose hope when the crash is continuously go. But for me, we must take advantage whe the market is down. The opportunity to buy back and but some altcoins in a bearish period will result to a great profit when the prices will grow.