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...
Never sell the crypto you have during the dip, keep holding it until the market rises and you have profit. Also if you have money besides the one invested, keep on buying more coins in dips part by part in each dip. Buying in dips will give you more profit and make your portfolio strong. Holding are buying are the two things one must do during dips and dumps to make a good and significant amount of profit.