Holding and swing trading can be promising higher profit than day trading but this is according to which level price we buy the coins. If we start now to holding for a few years, is look like no good idea because after nearly 1 year in bull season, the market can be changing to bearish. Good duration for holding now is less than a year or just a few months. From historycal of total marketcap, the best time to holding crypto in in 2015 and sell in the end of 2017, and start again to holding in 2019/2020 and sell in the end of this year. We also should be looking for good and strong fundamental coin for holding.