How long this uptrend goes for Bitcoin?

I know some of you guys is now doubting Bitcoin because of it's 50% downtrend this year of 2019. But to lighten up your mood I have read a article that's referring to Bitcoin and other cryptocurrencies saying that it's still the best investment and far from from dying. Here's what I'm talking about, https://www.newsbtc.com/2019/12/16/despite-50-percent-crash-bitcoin-up-2019-bulls-uptrend/