Now it's good time to jump into altcoins for next year. There are many good buying opportunities.
Top 5 in my opinion:

- Litecoin: Cross-chain atomic swaps can occur off-chain instantly with heterogeneous blockchain consensus rules. So long as the chains can support the same cryptographic hash function, it is possible to make transactions across blockchains without trust in 3rd party custodians.

- Ark: I think it's undervalued, it will explode.

- Waves: Waves NG protocol is very good. Waves will increase the price x20 in 2018 because of smart contracts.

- Electroneum: the mobile mining approach might be mainly for publicity (it's not a real mining), but publicity is exactly what crypto currency needs.

- NXT: there is a good airdrop on Dec 28th, you will receive 0.5 IGNIS for every NXT.