Actually, it's difficult to guess when will the price of Bitcoin rise. But if you have control of your fate & believe in the technology, then go for a buy.
Please don't buy what you dont understand. And my suggestion is research, research and research.
Happy trading

As you said no one will know that when the price will increase or decrease,but we can make some assumption by closely monitoring the bitcoin statistics.Nowadays the bitcoin price is increasing slow and steady.So i think it is the right time to buy the bitcoin because the price maybe reach $5k or $ 10k in the near future.So buy the bitcoin today and hold it until the price shootup when the right time comes trade it and have more profits.