Hold it mate, that is the best option I have for you, Why you want to loose your 7 btc to make it quick to 17 btc, you can even take it to 70 btc if you hold and sell it at a right time.
Holding is not the option to increase your 7 bitcoin to 17 bitcoin. Holding will get good profit but increasing more than 100% is highly not possible.
Holding really wont add much bitcoin to you to make it 17, well try to invest it smart or maybe to smart trading then who knows you might get that 17btc in a year.