As big as Bitcoin is, it is always a good idea to diversity into other coins just in case Bitcoin sleeps for a while. 2018 will be the year of the privacy coin, I believe. If you missed out on Bitcoin's low prices, it's not too late to get in early with a privacy coin such as DeepOnion which is one of the best deals around right now. There are still Airdrops going on, so there is still some time to get in and get some free coins.