When bitcoin goes down, the price of altcoin decreases deeply and it is difficult to return, so I think at the end of 2019 is the right time to buy altcoin for the long term for a few weeks or months, because if trading in the short term is very risky in this situation if bitcoin falls then the altcoin market will be chaotic
Bitcoin has recovered a bit this year, but none of that happen to altcoins, however, we can't say that altcoins will just be eliminated in the market, they will remain especially those who have a good team that are focus on the future, so good timing to buy them right now.
With thousands of altcoins in the market, we might get confuse but with proper research we will certainly choose the right coins to invest.
This is just part of the journey where sometimes it struggles but it will surely recover in time.