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 ?
Even if you have only $1500, you can invest in the same way as rich investors. This is a plus cryptocurrency market. Such investments are available to a person with any capital. Moreover, if you have little money, then you have a great opportunity to learn how to invest while you are not rich