Yeah. Last year, was the best one for Bitcoin and other cryptocurrencies. As well as you, I've earned a lot of money holding onto my Bitcoins, and have managed to invest the profits into other coins that have made me multiply my earnings within a short time frame. Now, 2018 has begun and will bring many more exciting things for the whole cryptocurrency ecosystem.
Right now, Bitcoin hasn't risen that much in value, but experts say that in a few years from now, Bitcoin will be worth much more than what it is nowadays. That is why, I believe that the wise decision would be to hold onto your Bitcoin for the long term as it continues to make strides in the mainstream world. Once everyone starts using Bitcoin's SegWit feature, and the Lightning Network becomes active, it will pave the way towards outstanding growth of the cryptocurrency.
I have the feeling that this year might end with each Bitcoin becoming worth $30,000+. Only those who have invested earlier into Bitcoin could reap up the profits in the future. Just my thoughts.