At the moment it seems to me that keeping bitcoin is a good idea. The course is still growing and in a while, longer or shorter you will be able to get richer than you are now. Good luck!
Yes, keep the bitcoin save and if you have money its better to buy more bitcoins because i am sure the price will touch 100,000$ before December 25, the Chrismas day in 2018 . People are buying like madly and they know they will get bitcoin Silver (not confirm yet) for free which can be worth a 1000$ even.
So keeping buying and enjoy the profits.
That's the spirit, we need more people to really believe in bitcoin. I myself am currently holding some bitcoins and might be buying some more when it dips down to around $6k. Currently its around $7k, and the trend is still going down. So buy more to hold and sell them soon when its price increases back again.