The best altcoins to buy apart from bitcoin:

Ethereum: Eth v2.0 will launch in 2020. Buy ethereum before it's too late and price go up.
LINK: Many people are discussion on this coin potential in this forum. So, do your research on this coin and see what happen.
Titan Coin: I heard a lot about titan coins in this forum and other youtube and media networks, it seems like they are launching many apps these days and maybe price go up. However, please do your research first before investing in altcoin.
Litecoin: The brother of bitcoin. Go for it.
Binance coin: If you want to take low risks, and need stability, go for it.