Well, let me start by saying that cryptocurrencies are generally volatile and erratic, such that it becomes extremely difficult to predict the market direction.
That said, if we see any rally in the next six months, the following are some of the coins that should make a big move:
ETH, STEEM, EOS, BNB, and TRON.
Well, we will see.
I am not familiar with all the alts out there. One altcoin that I know that has a potential and very undervalued is the Ve Chain Thor or VET coin.
It has lots of uses or market already and partnerships, but its value is not even on 0.01 right now. It also has a big capital but a lot of lesser known and used altcoins have higer value on compared to the VET coin.
I am no expert or done extensive research about this coin so, I do not know what is wrong why ia value is too low.