If you already bought your BTC, just hodl on to it.
You could buy a few GHs at cex.io and mine very little before it becomes unprofitable, and hope to sell your GHs to a noob, but you could end up with less BTC if you don't get out at the right time.
....just beware mining at cex.io is unprofitable the very second you buy any GHs from them.
IMHO, right now and in the forseeable future - look for an acceptable BTC price and then buy BTC directly / or spread your buying over a longer period of time (cost averaging) if you prefer that.
Mining usually equals losing money, unless you can quickly get your hands on expensive high-end equipment that does ROI really fast.
Not mining keeps you clear of scams (overpriced/non-delivered/late-delivered hardware) and Greater-Fool-Deals (2nd hand hardware w/ negative ROI, every cloud mining deal in existence like cex.io) in the best way possible.
At the end of the day, that risk management alone may usually be worth more than your total planned investment.