Mining is expensive, you need to pay electricity, mining equipment, and only then you can count on profit. Sell enough to cover your expenses, to buy something for yourself, and what is left try to save (something I don't do, and I don't know how) but as we can see price is rising, and this thread is from last november, now price is three times higher, so waiting was smart thing to do in that moment.
Again it's individual decision, every person here is in different situation. Calculate your monthly expenses, see what you need and do what is best for you. Saving coins for future is good thing for now cause price is rising each year. But not everyone of us can afford to wait that rise.
It depends on what you mine. If you mine the bitcoin, ASIC will be useless in a year. But if you mine the altcoins, GPU can be sold later.
Mining bitcoin is not profitable now if you are not using an advance equipment and the difficulty will increase every halving until those who will remain in the business are only the big companies whose main business is mining, maybe the best option is to manage a potential altcoins and hold it for the long term.