What is your best plan, if you look at the uncertain crypto market situation, do you have plans to invest in several altcoins?
what coins do you think will be good in 2019. Thanks.

You can always recommend top coins to buy, top 20 or a little more. And those who have a relatively stable capital and the number of coins in circulation, acceptable for you.
You can still follow the "signals" of several market analysts to make quick purchases of some small coins.