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 ?
I think divesify of the investments is the way how people invest and i dont think it would be really necessary to diversify your investments. The important think of investments is the knowledge and the trust of the project, i think it totally okay to invest all of your money into one project but you should sure that its not a scam project and it's a good one.