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 ?
It's not called diversification investment. It's called reasonable financial allocation and this is quite effective for a stable development bitcoin. Now is the time when bitcoin is going down and you should not buy it anymore. hold and wait. That would be the best strategy now.