VEN , NEO , QTUM and NANO are the best !! just hold them and never sell. I dont know how long you wanna hold them but if you wait at least one year you will have big gain in the end. VEN can make new ath in September. NEO can make 3x in any time . Qtum will grow every 3 months. First rule is btc price for now so wait until btc recover if you wanna sell before new ath's.
I have no plans to sell (yet) but part of my strategy is to collect earnings depending on each coin's trigger (usually at x3 the purchase price-- but may vary depending on activity at that point). It worked for me so far and I don't plan on changing it.
I may also flip/trade if I have sense an upcoming drastic BTC price movement (up or down).