If you are a fulltime trader,I believe you can earn a passive daily income as a day trader. I suggest you to buy at least 3 altcoins in the top 5 list during the dip then observe the movement of the market price as it goes up before selling it.But this kind of trading needs patience and techniques as to when to buy and sell your coins for a better profit.I bet $100 as what you've said is just a little amount so you better choose the promising coins to trade.