Holding bitcoins for a long time is probably a good idea especially if you bought in at a good price. With that said, you can always buy bitcoins and just keep it on a wallet that isn't connected to the internet at most times so that you will be sure that you'll be keeping your coins in a safe place and that no one will hack or compromise your money. I've been doing the same thing for 2 years now and so far it only nets me profits most of the time.
You havent made profit until you sell your coins
. You have to catch a high peek, many people in all sort of investments wait for too long, expecting it to rise and rise forever, which is not the case. I'm not telling you to sell, I also save it for now, but with bitcoin you can potentially come to zero profit. 
