Yes stick with Bitcoin holdings and invest your time (not money) in other side projects that have the potential for a large payoff with small downside.

Two examples are JSECoin and Yenten - these can both be mined using a CPU

JSECoin unlike so many other cryptos has a genuine real life use case website monetisation / advertising. It is currently pre ICO so you have a chance to mine some coins now that could do well in future.

I like Yenten as it has no premine and is a CPU mining algorithm. It also has a fun/crazy website and could catch on. Its cheap around 6c and Ive started mining it for fun and will try to buy more if gets bit cheaper. It does have a tiny mkt cap and low volume but I find it interesting and fun project for some reason. Here's good post on mining it https://www.reddit.com/r/Yenten/comments/7qtq63/how_the_hell_do_i_mine_this/

https://medium.com/@tsarbuig/yenten-discovering-the-next-doge-3b36f797f764