Well, I have a friend who gain more profit through holding and waiting,he able to kept the coins he has since Feb.2017 up to Dec.on the said year and then it happened that on that month the price was doubled,that was just one example of it.
There will be more jumps, but you just need to figure out which coins you need to save for a long time. And at the moment I think the best option to deal with resale altcoins and earn.