I am not sure if 2018 will be the year of the altcoins rather than another btc year, but i watched myself following the trend.
I took 70% of my BTC holdings and put them into ETH, XRP, WAVES and some small % into DCN and LIFE.
DCN had a nice curve recently and LIFE ist just an experiment for me.

I earned a lot with BTC last year and this year i want to experiment with my profit and see if i am able to analyse markets as good as i thought.

But honestly?
You wont do anything wrong putting your money in ETH and XRP for now. =)

Remember that this is what I think and make your own decicions.