Well as others have said Cardano and EOS will be the two big blockchains of 2018. But their room to "go up as high as possible" is kind of limited since their market cap is already very high. Unless the market cap of the entire cryptosphere increases substantially this year, but who knows.
Your best bet is to research ICOs that have a low market cap but good teams and a good product.
If the market cap of the whole market goes up then it is better to invest in other projects, people make this mistake all the time, cardano already pumped, there is no point in investing in it unless you are thinking of investing in the long term and the only coin I'm going to invest in the long term is bitcoin, so that is not an option for me, so if you want to make money the only thing you can do is to look for new projects with potential.