Just set aside a cash or fund that you are prepared to lose when you are investing in a cryptocurrency like bitcoin. This kind of investment is always risky and if you are not yet prepared for this then educate yourself first on cryptocurrencies. Bitcoin stays below $4000 and still good to buy, many believes that the coin will further go down this year before pumping again.
That is correct, newbies have tendency though to buy 1 bitcoin in a hurry. There is a proven method that you can purchase in small amounts and gradually increase and you would not noticed that you have stash more than 1 bitcoin already. So I will say that since the price is tanking at $3-$4K, its still a good time to get in while they are still at a discount price.