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well you for sure wont be doing much wrong with holding BTC for this year.

I have been holding only btc as well, unfortunately I got in only in september 2017 and bought until almost 1.15BTC. About a month ago I started to diversify my holdings and now I have a value of 3 BTC without any additional investments, so thats about the amount ;-)

Diversification is really importnat, not only for cryptos but also in general, maybe you want to give it a second thought.

as I said only a part of my portfolio is in BTC I have KCS ETH EDO XEM SGR BTX