If you are mining coins then it does not really matter if you sell them right away or save them for the future. Either way you will make a profit so it is really up to you. If you want to make more money then waiting for the price to go up is the option to choose, if not then sell them right away.
I mine the bitcoin. I keep most of them. I just use some to cover my cost. I will make more profit if I keep them longer.
You also better now keep them because the worth is going to get up and the fact is also that the bitcoin is going to a higher amount for sure with it nice amount of bitcoins.
You can make so munch profit with mining and now holding, mining will also not be profitable anymore when the halving is happened.