Usually they recommend you to diversify your investment, so you avoid losses.
But as a real approach, having $1.5k, would you invest in how many cryptocurrencies ?
What if I invest little by little, only in Bitcoin, would that work as well ?
Too small as investment, I will buy bitcoin first and wait another day to buy altcoins when I have spare money. I don't expect fast profit in trading by this amount of investment so I will just wait and keep work to obtain more money to buy more coin especially bitcoin. I will still diversify my investment to btc, bch, eth and in ICO.