If I know which Altcoins have the opportunity and will increase high in the next year then I will invest half of my current portfolio and I will definitely be a rich man next year. 
However, unfortunately I can't be sure of that. But I have a prediction, there are 3 coins that I think are worth investing in right now, these coins are all at the top of Coinmarketcap.  Ethereum, BNB and Cardano are my Altcoins of choice...
I am optimistic that Next year Bitcoin and Cryptocurrency prices in general will experience an increase in price and many coins will reach new ATH.
Especially for Cardano, I dare to invest more than Ethereum and BNB.