mining coin if calculation profit sell it
but bitcoin price is low and calculation still lost save itu or use trading
calculation include electicity and tool hadware, and another operating cost
The calculation must be right, so he can really know how much is his profit. I think even he get big profit, its will be wise if he only sell his coin to fulfil daily need and save the other for investment.
If you're mining altcoins, which is obviously the case with OP, then you're better off just selling them directly to Bitcoin.
Altcoins are known to lose the majority of their value over a good number of months, so from that view, you'll be crazy to keep holding these coins.
That's however not the case with near dead coins. In that regard you are better off saving them up till you have a decent stash in case the price happens to explode.
It's more like a gamble, but it might work out as some coins that have been marked as dead, miraculously come to life and explode in value.