15x is certainly an amazing return for 1 year, and not really available to individuals before the advent of cryptocurrency... I wonder though if the amazing returns people saw in 2017 will still repeat this year, or we will see it drastically slow down.
Earlier is certainly better, is the right thing if we put all our money on cryptocurrency, as happened with my experience, a year ago I got $ 5000 and I use to invest cryptoucrrency and the result I get profit more than 15x.