You mean the market accepting new coins? Sometimes new coins get big pump with multiple times, making huge profits for investors.
Is there a way to predict future pumps though? Or is it just pure luck?
No, there's no way to predict future pumps unless you join a pump-and-dump group. Usually though if you follow news of that coin you investment, you may have a idea as to when they going to release some development and this sort of news might pump the price later. Just look at how XRP has been pump in the last 2-3 days because of the Xrapid news.