No, there's no guarantees with any sort of investment, really stupid to think otherwise to be honest.
If price will be down. All country people buy and hold the coin long time. So if buy the coin then coin will be desires in the market place. Then price will be increase. Most of the people wait for the price increase. But people know the price information. Market is right place to gather more coin information and price up and down. So time is important of the all process. So complete the process on time.