Wait for the dip?
You have know when dip, you don't thing so now is time to buy, because next year or 10 year price become 1000x from now, who's now?. the best is buy now or bought from yesterday, dont messed up tomorrow.
it would be necessary not to talk about falling, but to use the chance at the end of 2018, when the ethereum, for example, reached $ 76. It was then that there were really good opportunities for profitable investments. But if you consider the possibilities of ethereum in the future, then even the current price of $ 250 is also beneficial for long-term investments.