Actually, I do not think bitcoin will have a big change this year, which means altcoin is going down, I think it's best to keep the bitcoin and wait for the altcoin to fall down.
Even if the change in the values of Bitcoin is not so obvious this year, it is not a big issue. One should always invest as long as there is a prospect of future profit.
Besides, the market level of Bitcoin shows clearly that it will be the future of cryptocurrency and the spread in the scale of the technology is endorsing the investment decisions. So from the pint of view of an investor, whose only purpose is to earn, investment in Bitcoin is the lucrative opportunity right now.