I just saw this thread and I know you must be smiling now if you bought the dips in December 2018. Almost everywhere is green, at least better than December 2018. Investing in good crypto coins is very profitable, just hold and don't sell when the price is lower.
well, investing in crypto is not always profitable
because its depends on where we drop our money, if we drop our money to a shitcoins, for sure we will lose it buddy
so, many expert will said DYOR before investing

Well if we don't study or search some coins to invest maybe our money will put to a shitcoins to invest.
So we need have time to think about it comes of investment so that we cant lose our money early. For me must better to choose those popular coins in the market.